After recovering refrigerant through a bolt-on piercing valve on a small appliance, what should the technician do with that valve?
- ALeave it clamped in place so the sealed system can be checked again on a future service call
Leaving the valve on for future convenience is how technicians create the leak they come back to fix. The gasket dries out, and the appliance loses charge slowly through the fitting.
- BLeave it installed but back the piercing needle all the way out of the tubing
Backing the needle out does not remove the leak path. The gasket is still the only thing sealing the pierced tubing, and it degrades whether the needle is in or out.
- Remove it and permanently seal the tubing by pinching the line and brazing the opening closed
- DReplace it with a Schrader core of matching diameter and leave the saddle clamp in place
Swapping in a Schrader core keeps the saddle clamp and its gasket on the tube, so the same slow leak path remains. Schrader valves also leak past the core seal over time.
Why C is correct
A piercing valve seals only by gasket compression, so it is a temporary fitting by design. Once recovery or service is finished, removing it and closing the tube by pinching and brazing restores a permanent hermetic seal and eliminates the leak path, which is exactly what the appliance had when it left the factory.
What this question is testing
This checks sealed-system service practice and whether you understand that preventing future leaks is part of Section 608 compliance rather than merely good workmanship. Every distractor here is a shortcut that technicians actually take in the field, so the question rewards knowing why a gasket-sealed saddle fitting is temporary by design and cannot stay on the appliance.
On the job
Appliance techs see the evidence of this constantly: a refrigerator that was repaired two years ago comes back low on charge with an oil stain right at an old saddle valve. Line taps are convenient for getting a gauge on a sealed system quickly, but they belong on the truck, not on the customer's appliance. Pinching the process tube and brazing the end is a two-minute job that decides whether the repair lasts.
Memory technique
Pierce it to service it, pinch it to finish it. Nothing bolt-on stays behind.
Exam tip
Piercing and saddle valves are temporary. Any answer that leaves one on the appliance is wrong.
Where to look it up
Leak prevention practice for small appliances: piercing valves are temporary access and must be removed and the tubing permanently sealed.