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    nida quadeer's Avatar
    nida quadeer Posts: 1, Reputation: 1
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    #1

    Mar 9, 2010, 11:49 PM
    What is P or S trap
    What is P or S trap
    kp2171's Avatar
    kp2171 Posts: 5,318, Reputation: 1612
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    #2

    Mar 9, 2010, 11:55 PM
    P trap


    S trap
    kp2171's Avatar
    kp2171 Posts: 5,318, Reputation: 1612
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    #3

    Mar 9, 2010, 11:59 PM
    In both cases waste water drains from above and flows through the trap line to the waste line... notice that some water will always stay trapped in bottom of the U shape... this makes a water seal that prevents odors and noxious gases from the waste-vent system from entering the home.

    Think about a portapotty... stinks, eh? No trap. The traps you mentioned help keep those nasty and dangerous gases from entering your home.
    afaroo's Avatar
    afaroo Posts: 4,006, Reputation: 251
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    #4

    Mar 10, 2010, 08:47 AM

    A sink's P-trap is there to seal off the pipe with water to keep sewer gas that bypasses the vent from rising into your bathroom

    A P trap goes through the wall an S trap goes through the floor.
    S trap can self siphon and thus it is against most codes in civilized countries.
    Most codes frown upon carcinogenic fumes from entering a structure.

    I hope the above info will help you, Thanks.

    John
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