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    mighty_O's Avatar
    mighty_O Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Apr 4, 2010, 10:23 PM
    Can two traps on one tub work?
    Can two traps on one tub work?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #2

    Apr 5, 2010, 03:58 AM
    Hi MightyO,

    Two traps are completely illegal (in terms of plumbing code) and unnecessary. A traps job is to prevent sewer gasses from the sewer system from getting into your home, so two traps can only lead to problems like:

    1) clogged drain line (inaccessible trap can get clogged and will be hard to clean).

    2) siphoned trap(s) (first trap could cause the 2nd trap to siphon out especially if the traps are close to each other... this would allow sewer gasses into the home).

    Why are you asking?

    Let us know more...

    Mark
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    Apr 5, 2010, 06:19 AM

    Mark nailed it! Section 703.6 (Double Trapping) of The Standard Plumbing Code states:
    No fixture shall be double trapped.
    Please explain why you would wish to double trap your bath tub. Regards, Tom
    stew_1962's Avatar
    stew_1962 Posts: 255, Reputation: 10
    Full Member
    		  
    #4

    Apr 5, 2010, 06:46 PM

    Simple answer, no. Had the same issue in this old house - ugly fix.
    mighty_O's Avatar
    mighty_O Posts: 4, Reputation: 1
    New Member
    		  
    #5

    Apr 5, 2010, 10:49 PM
    Quote Originally Posted by massplumber2008 View Post
    Hi MightyO,

    Two traps are completely illegal (in terms of plumbing code) and unnecessary. A traps job is to prevent sewer gasses from the sewer system from getting into your home, so two traps can only lead to problems like:

    1) clogged drain line (inaccessible trap can get clogged and will be hard to clean).

    2) siphoned trap(s) (first trap could cause the 2nd trap to siphon out especially if the traps are close to each other...this would allow sewer gasses into the home).

    Why are you asking?

    Let us know more...

    Mark
    Just curious just wanted to know
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