A P trap is part of the drainage system for any fixture and has an important purpose in the plumbing and septic system, The P trap is used to keep the gases from coming back up though the drain of the fixture.
What is a slip by slip fitting?
In the plumbing trade there are many many combinations of plumbing fittings and the ends of the fitting will make a difference, This short lesson will explain to you what a slip by slip plumbing fitting is ( slip x slip ).