A shower drain is roughed in before the waterproofing inspection. Which fixture trap size is commonly used for a shower?
Correct Answer
C) 2 in.
A shower commonly uses a 2 in. trap and drain. Other choices are lavatory, sink, or larger branch-drain sizes.
Why This Is the Correct Answer
A shower commonly uses a 2 in. trap and drain. Other choices are lavatory, sink, or larger branch-drain sizes.
Why the Other Options Are Wrong
Option A: 1-1/4 in.
Choice A gives 1-1/4 in. Its specific error: 1-1/4 in. is a different drainage slope than the pipe size in the item; the accepted slope is 2 in. The accepted answer is 2 in.
Option B: 1-1/2 in.
Choice B (1-1/2 in.) is rejected because 1-1/2 in. is a different drainage slope than the pipe size in the item; the accepted slope is 2 in. The cited answer is 2 in.
Option D: 3 in.
The trap in D is 3 in. That selection is wrong because 3 in. is a different drainage slope than the pipe size in the item; the accepted slope is 2 in.; A shower commonly uses a 2 in. trap.
Memory Technique
Make shower trap size a tabbed card: cite the exact condition, then choose 2 in.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use the index entry or section for "Fixture trap sizing" to confirm that A shower commonly uses a 2 in.
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