How do P traps work?
Similarly, are P traps required?
(1) Traps required. Each plumbing fixture, except listed toilets, shall be separately trapped by approved water seal “P” traps. The “P” trap must be installed at the center fixture when three such fixtures are installed. (3) Prohibited traps.
One may also ask, what's the difference between an S trap and P trap? The only difference between a P-trap and an S-trap is the horizontal length of pipe on the outflow side which allows you to connect the vent. You can turn an S-trap into a P-trap by adding this pipe -- it should be at least 4 inches long -- and connecting a vent to it.
Then, how far below drain should P trap be?
According to the International Residential Code, the maximum vertical distance between the sink drain and the entrance to the p-trap is 24 inches.
What does the P stand for in P trap?
A P-trap gets its name because it combines two 90 degree joints with a horizontal overflow pipe and gives the entire unit the shape of the letter “P.” One of the 90 degree joints exits the drain of the sink and then is joined to another which contains a water seal system that allows for water to flow into the overflow