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Fixtures & Fixture Fittings — Plumber Practice Questions

55 questions · 12% of the Plumber exam

Worked questions

1. The public toilet facilities required for a mercantile building are located off a rear corridor rather than in plain view of the sales floor. What does the IPC require so that the facilities can be found by those they serve?

  • AA posted floor plan at the main entrance showing the route from the entry to the restrooms

    A posted floor plan is a wayfinding aid some owners provide voluntarily. The code asks for identification at the facility, not a directory at the building entrance.

  • A legible sign designating each required public facility, readily visible and located near the entrance to that facility
  • CNothing at all, because identification of toilet rooms is governed only by the accessibility standard

    The accessibility standard adds its own signage rules, including the symbol of accessibility, but the plumbing code independently requires required public facilities to be designated.

  • DAn illuminated sign of the same type used for exits at every corridor intersection along the route

    Exit-style illuminated signage is a means of egress requirement in the building code. Borrowing it here is a plausible-sounding but wrong answer.

Why B is correct

Required public facilities must be designated by a legible sign that is readily visible and located near the entrance to the facility. The requirement is about identifying the room itself, not about wayfinding from the front door, and it applies to the facilities the fixture table required in the first place.

What this question is testing

The item tests familiarity with the administrative half of the fixtures chapter, which candidates skip while studying counts and clearances, and the ability to separate plumbing code signage from building code egress signage and accessibility signage.

On the job

This is a punch-list item on almost every commercial job. The general contractor buys signs late, hangs them on the door face instead of on the wall next to the latch side, and the inspector writes it up. It matters most in buildings where the public restrooms are shared between tenants, because without designation the tenants tend to lock them and the required facilities effectively stop existing.

Memory technique

Sign the door you must provide.

Exam tip

Signage questions in the plumbing code almost always resolve to legible, readily visible, near the entrance. Learn that phrase pattern.

Where to look it up

Chapter 4, Section 403, the signage paragraph following the separate facilities rules. The UPC treats identification of facilities under different wording, so verify against your adopted code.

2. The lavatories in a public restroom are being fitted with ordinary non-metering faucets. Under the IPC maximum flow rate limits, what is the highest flow those faucets may deliver?

  • A2.2 gallons per minute at 60 psi

    Two and two tenths gallons per minute at 60 psi is the limit for private lavatory faucets and for sink faucets. Applying a private limit to a public fixture is the most common error on this table.

  • B1.5 gallons per minute at 60 psi

    One and a half gallons per minute is a widely marketed voluntary efficiency value. It is not the code maximum for this fixture, and a question that offers it is testing whether the candidate reads the table or the packaging.

  • 0.5 gallon per minute at 60 psi
  • D2.5 gallons per minute at 80 psi

    Two and a half gallons per minute at 80 psi is the shower head maximum. Notice that both the flow and the test pressure belong to a different fixture.

Why C is correct

The maximum flow rate table in the water supply chapter lists public lavatory faucets other than metering faucets at one half gallon per minute at 60 psi. Metering faucets are governed instead by a maximum volume per metering cycle, which is why the question specifies a non-metering faucet.

What this question is testing

The item tests whether the candidate can navigate the maximum flow rate table by fixture type and reference pressure, and can distinguish public from private lavatory limits and metering from non-metering faucets.

On the job

This is a submittal review item more than a field item, but it lands in the plumber's lap because the fixture arrives, gets installed, and then fails a flow check or a green building verification. Aerators are the fix, and they are also the loophole owners use to defeat the rule, swapping in a high-flow aerator after the inspection. On restaurant and school work, expect the reviewer to check the faucet model number against this table line by line.

Memory technique

Public hands get half a gallon.

Exam tip

Every flow limit in the table comes with a test pressure. If the pressure in the option does not match the fixture, the flow is from a different row.

Where to look it up

Chapter 6, the maximum flow rates and consumption table. Several states, California most notably, adopt stricter flow limits by amendment, and UPC jurisdictions publish their own table, so verify against your adopted code.

3. A bathtub filler is being installed in a hotel guest bathroom served by a system stored above 140 degrees F. What does the IPC require of the bathtub fill valve?

  • AIt must be set so that the water leaving the fill spout never exceeds 110 degrees F, the tempered water limit

    One hundred ten degrees is a genuine code ceiling, for tempered water at public hand-washing facilities and at a bidet. Applying it to a tub filler swaps one fixture's limit for another fixture's limit.

  • BNo temperature limiting is required at a tub filler, because the bather tests the water at the spout and adjusts it before ever getting into the tub

    User judgment is not a code-recognized safeguard. Tub scald injuries disproportionately involve children and older adults who cannot test the water or climb out quickly, which is why the limit lives in the valve.

  • CIt must be a metering type that shuts off automatically after a fixed fill period, so the tub cannot overfill

    Metering valves are real fixtures and they do shut themselves off, but they are a public lavatory device for limiting the volume of a hand-wash cycle. Nothing about them limits the temperature at a bathtub.

  • It must be equipped with a device that limits the temperature of the water discharged from the fill spout to a maximum of 120 degrees F

Why D is correct

The fixture fittings section requires bathtub and whirlpool bathtub valves to be equipped with a device that limits discharge to a maximum of 120 degrees F. Because storage temperatures are commonly kept much higher for water quality reasons, that limiting device is what stands between the storage temperature and the bather.

What this question is testing

The item tests recall of the fixture-specific temperature limits and whether the candidate keeps the 120 degree bathing limit separate from the 110 degree tempered-water and bidet limits.

On the job

In hotels and assisted living you will store water hot and temper it down, either at a master mixing valve on the distribution or at each fixture. Field crews get caught when they install a code-compliant tub valve and then set the master valve above the tub limit, or when they replace a scald-limiting cartridge with a standard one during a service call. Note the setpoint on the valve and leave the cartridge that came listed with it.

Memory technique

One twenty for the tub, one ten for the hands.

Exam tip

Bathing fixtures cap at 120. Hand washing and bidets sit at 110. Match the number to the body part.

Where to look it up

Chapter 4, Section 424, the bathtub and whirlpool valve paragraph. UPC sets its own maximums for tub and shower valves and states them differently, so verify against your adopted code.

4. One building contains a restaurant on the ground floor and office suites on the floors above, each with its own occupant load. How does the plumbing code determine the number of fixtures required for that building?

  • AThe occupant loads are added together and the ratio for the predominant occupancy is applied to the total

    Choosing a predominant occupancy discards the ratio that applies to the other use, and the restaurant is usually the one that suffers.

  • BThe higher of the two ratios in the table is applied to the combined occupant load of the whole building

    Applying the strictest ratio to everyone overbuilds the low-demand portion substantially and is not what the table directs.

  • CThe ratio for the occupancy with the greater floor area is applied to the combined occupant load

    Floor area does not decide which ratio governs. A small restaurant can generate more fixture demand than a large office floor.

  • Each occupancy is computed at its own ratio and the resulting fixture counts are added together

Why D is correct

Each occupancy is evaluated on its own terms because the ratios exist to capture how a particular use behaves. Computing separately and then adding preserves that logic and produces a count that works for both parts of the building.

What this question is testing

Whether the candidate can apply the minimum facilities table across a mixed occupancy building rather than collapsing it to a single ratio.

On the job

Mixed-use buildings are the normal case in downtown work, and the fixture count drives how much core space the restrooms consume on every floor. Doing the arithmetic by occupancy also tells you where the fixtures have to be located, since facilities generally have to serve the occupancy they were counted for rather than being pooled at one end of the building. Get this settled before the core is laid out.

Memory technique

Count each use on its own ticket, then add the tickets.

Exam tip

Separate the uses, run the table once for each, then add. Never average occupancies together.

Where to look it up

IPC Chapter 4, minimum plumbing facilities and Table 403.1, including the provisions on multiple occupancies and where required facilities may be located. The UPC's occupancy breakdown differs, so use your adopted code.

5. A bathtub is specified with a deck-mounted filler whose spout outlet sits below the flood level rim of the tub, so a full tub covers the outlet. What does the plumbing code require for that installation?

  • ANothing further, because the tub's overflow prevents the water level from reaching the spout outlet

    An overflow is a partial safeguard against flooding a bathroom, not against back-siphonage. It also clogs, which is exactly when the level rises past the spout.

  • Backflow protection for that submerged inlet, since a spout below the flood level rim is a cross connection
  • CA check valve on the hot and cold supplies to the filler, installed in an accessible location under the deck

    Ordinary check valves are not recognized backflow protection for a submerged inlet, and burying them under a tub deck adds an inaccessible failure point.

  • DAn increase in the size of the tub's overflow so that it can carry the full flow of the filler valve

    Overflow capacity is a drainage question. Enlarging it does nothing about water being pulled back into the supply piping.

Why B is correct

The hazard is defined by geometry: an outlet under water with no air gap. The code answers it with backflow protection at the fitting rather than trusting an overflow that can be blocked with hair or a stopper.

What this question is testing

Whether the candidate can recognize a submerged inlet as a cross connection and knows that an overflow and an ordinary check valve are not substitutes for backflow protection.

On the job

Deck-mounted and floor-mounted fillers with low spouts are common on high-end tubs, and the compliant products carry integral backflow protection that shows up on the submittal as a listing number. When one arrives without it, the fix is a listed vacuum breaker in the supply at the required height, which is awkward under a finished deck, so catch it at submittal review. The same reasoning covers hand showers on hoses that can reach the bottom of a full tub.

Memory technique

If the spout can go under, the supply needs protection.

Exam tip

Any outlet that can end up under water is a cross connection. Look for the answer that adds backflow protection at the fitting.

Where to look it up

IPC Chapter 6, protection of potable water supply, read with the bathtub and fixture fitting provisions in Chapter 4. The UPC handles submerged inlets in its own backflow chapter, so verify in your adopted code.

50 more in the bank

Answers and explanations for these are in the app.

  • Under the IPC, what is the minimum dimension from the centerline of a water closet to the nearest side wall, partition, vanity, or other obstruction?
  • The IPC requires a minimum clear space measured from the front of a water closet, urinal, lavatory, or bidet to any wall, fixture, or door. What is that minimum?
  • What minimum centerline-to-centerline spacing does the IPC require between adjacent fixtures such as two wall-hung urinals?
  • The IPC requires accessible plumbing fixtures where fixtures are required, but the detailed accessible clearances, heights, and grab bar locations come from which referenced document?
  • Applying the minimum plumbing facilities table to an occupant load produces 3.2 required water closets for one sex. How does the IPC require that fractional result to be handled?
  • In assembly and educational occupancies, what is the maximum share of the required water closets that the IPC permits urinals to replace?
  • What is the maximum water consumption per flush that the IPC permits for a water closet?
  • The existing water closets consume 3.5 gallons per flush and the replacements consume 1.6 gallons per flush, both values given. The restroom logs 220 flushes on a typical school day. How many gallons per day does the swap save?
  • When nonwater urinals are installed, what does the IPC require to be provided at each urinal location?
  • The IPC requires tempered water to be delivered to public hand-washing facilities. What temperature range does the code define as tempered water?
  • Each public lavatory is served by a metering faucet that delivers 0.25 gallon per metering cycle, given. During a halftime rush, 12 lavatories each cycle 30 times. How much water is delivered in total?
  • What is the minimum interior cross-sectional area the IPC requires for a shower compartment?
  • Which type of control valve does the IPC accept for an individual shower, with maximum setting limited to 120 degrees F?
  • The shower receptor floor must pitch toward the drain at a uniform 1/4 inch per foot, given. The drain sits 42 inches from the back wall of the receptor. How much higher than the drain must the bed be at that wall?
  • What does the IPC require regarding the circulation pump once a whirlpool bathtub is enclosed?
  • Which part of the IPC do you open to determine whether a service sink is required for a given occupancy and occupant load?
  • How does the IPC treat water dispensers relative to the required number of drinking fountains?
  • What does the IPC require for a floor drain trap that is subject to losing its seal through evaporation?
  • How does the IPC require a floor-outlet water closet to be secured and finished where the fixture meets the floor?
  • What does the IPC require for a domestic food waste grinder installed at a kitchen sink?
  • Table 403.1 sets the minimum number of plumbing fixtures based on the number of occupants served. Under the IPC, how is that occupant load established for a given space?
  • The minimum plumbing facilities table is organized by occupancy classification. Which classification row governs the required fixture counts for the dining room and bar area of a full-service restaurant?
  • Each of the two toilet rooms in this suite is designed for use by one occupant at a time and has a door that can be locked from within. Under the IPC, how may the fixtures in those rooms be credited against the required fixture counts?
  • The IPC generally requires separate toilet facilities to be provided for each sex, and then lists specific situations in which one facility may serve everyone. Which situation is one of those listed exceptions?
  • A warehouse has employees working the floor and a counter area where drivers and vendors are received. Under the IPC, how must toilet facilities be provided for this building?
  • Using the minimum plumbing facilities table for a one-family dwelling, which set of fixtures represents the minimum that must be provided in the dwelling unit?
  • A lavatory is being trimmed out and the waste fitting is being checked. What is the minimum size of the waste outlet the IPC requires for a lavatory?
  • A bathtub is being replaced by a shower, and the crew wants to reuse the existing tub waste and trap. What is the smallest waste outlet the IPC allows on the new shower?
  • Six shower heads in one gang shower room will be supplied from a common hot and cold branch. Under the IPC, how must the discharge temperature at those shower heads be controlled?
  • A floor-outlet water closet is being connected to the closet flange on the drainage piping. What does the IPC require of that connection?
  • The IPC lists fixture designs that are not permitted to be installed. Which water closet design falls into that prohibited category?
  • A public toilet room in a commercial building is being roughed in. Under the IPC, in which situation must a floor drain be provided in that toilet room?
  • A flushometer valve serving a water closet connects the potable supply directly to a fixture that can be full of contaminated water. Under the IPC, how must that connection be protected?
  • A water closet in an existing building has cracked and is being replaced. What does the code require of the flush volume of the replacement fixture?
  • A single cold water branch will serve four flushometer water closets, four public lavatories and two flushometer urinals. Take these demand values as given data: each flushometer water closet 10 water supply fixture units, each lavatory 1.5 water supply fixture units, and each flushometer urinal 5 water supply fixture units. What total demand in water supply fixture units does that branch carry?
  • A concourse restroom holds six flushometer water closets and four flushometer urinals. Take these consumption values as given: each water closet uses 1.28 gallons per flush and each urinal uses 0.5 gallon per flush. On an event day each water closet is flushed 90 times and each urinal is flushed 140 times. Approximately how much water does the restroom use that day?
  • A flushometer water closet on the top floor requires 25 psi flow pressure at the fixture, given. Static pressure at the meter is 68 psi, the fixture sits 46 feet above the meter, and friction plus meter losses along the path total 14 psi. Using 0.433 psi per foot of elevation, what pressure remains available at that fixture?
  • A shower receptor is being built up with a sheet membrane liner before the mortar bed and tile are installed. What does the plumbing code require of that liner where it meets the walls of the compartment?
  • A shower compartment is being fitted with a ceiling rain head, a hand shower on a hose and four body sprays, all served by one valve and used in the same compartment. How does the plumbing code treat the flow from that arrangement?
  • A gang shower room has five shower heads that all run at once for 8 minutes after practice. Take these values as given: each head delivers 2.5 gallons per minute of blended water, and the blend is 70 percent hot water. How many gallons of hot water does that 8 minute period consume?
  • A restroom's water closets are dual flush units. Take these values as given: a full flush uses 1.6 gallons, a reduced flush uses 1.1 gallons, the closets are flushed 400 times in a day, and 70 percent of those flushes are reduced flushes. How much water do they use in that day?
  • A bathtub is being installed and its waste and overflow assembly is being connected to the fixture drain. Under the IPC, what is the minimum size of the waste outlet serving that bathtub?
  • A whirlpool bathtub is being installed and the circulation pump has to be positioned before the tub deck is framed. Where does the plumbing code require that pump to be located?
  • A single-occupant toilet room has been built on the kitchen wall of a restaurant, and its door opens directly into the area where food is prepared for the customers. The owner points out that the door is tight-fitting and self-closing. How does the plumbing code treat that arrangement?
  • A public restroom's required water closet count has been established from the minimum plumbing facilities table. How is the required number of lavatories for that restroom determined?
  • A restroom is required to provide accessible plumbing fixtures. How do those accessible fixtures relate to the minimum number of fixtures the facilities table requires?
  • A powder room layout places the centerline of the water closet 14 inches from the side of an adjacent vanity cabinet, and 15 inches from the finished side wall on the other side. Under the IPC clearance requirements for fixtures, what is the status of that layout?
  • A shower compartment is proposed at 28 inches by 34 inches of interior finished dimension. Take these limits as given: the compartment must provide not less than 900 square inches of interior cross-sectional area and must be capable of encompassing a 30-inch circle. What is the status of that proposal?
  • A floor-outlet water closet is being set after the finished floor has been installed. Where must the closet flange sit in relation to that finished floor?
  • The minimum plumbing facilities table requires a service sink for a tenant space. Which installation satisfies that requirement?

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