S-trap, P-trap and skew trap toilets

What’s the difference between a P trap, S trap or skew trap toilet? The answer has everything to do with the shape of the toilet plumbing.

S-trap

The S-trap toilet pipework usually exits through the floor.Sketch of toilet with S-trap plumbing

P-trap

The P-trap toilet pipework usually exits through the wall directly behind the toilet.
Sketch of toilet with P-trap plumbing

Skew trap

The pipework for a skew trap toilet exits out one side.
Sketches of toilet with skew trap

 

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