1. The shape. Their shape is the most notable difference between the two plumbing trap types. Both traps take after their respective letter, so the S trap is shaped like an S or snake shape, while the P trap consists of a single curved seal which then extends out into a waste arm extension, just like the letter P.. An S-Trap is a type of trap for plumbing. The purpose of an s-trap (or any plumbing trap) is to "trap" water inside the "u" section of the pipe. That trapped water creates what the plumbing code calls the "trap seal.". The trap seal is the single most important component of your DWV plumbing system because it blocks sewer gas..

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Types & Sizes Explained. P-trap is a p-shaped bend pipe used in drainpipes to connect your sink's drain directly to the sewer system or septic tank. In usual circumstances, p-traps always retain some water. They are made of cast-iron sheets or UPVC and have a robust water seal.. S-trap and P-trap drain pipe installations are similar, but significant differences exist. S-traps are typically more straightforward and quicker to install due to their simple design, but a vent is required to prevent siphoning. P-traps need a deeper trap arm and discharge, requiring additional fitting.