plumber: Under the Sink
- 01/05/12 02:54 PM
What is a P-Trap? Take a look under any bathroom or kitchen sink. If the plumbing was professional installed, you'll see a u-shape pipe with a pipe 'leg' running to the back of the cabinet... It looks like the letter P laying down.
This is called a p-trap. Its design has two purposes: First, to allow the water from the sink to flow out and to keep sewer gas from coming in; it's in the U portion of the drain that water literally sits and forms a seal (water seal)...
...and Secondly, the p-trap can catch items that might go … (3 comments)
plumber: Plugged... Not Good
- 12/18/11 12:22 PM
This is a temperature pressure relief valve (TPR valve) on a water heater.
A TPR valve is a safety valve.
If something goes wrong with the water heater (i.e., the water heater doesn't turn Off after reaching the set temperature)... the valve is designed to open when a certain internal tank temperature or pressure is reached... and the hot scalding water under pressure flows out a discharge pipe to the exterior per today's requirements.
In this photo, there's no installed discharge pipe and the TPR valve has been plugged... Defeating the purpose of a safety valve... Not good.
What is a P-Trap? 
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