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    Concern for basement p-trap connection to main line

    SRDENNY: Thanks for keeping me honest regarding the venting. I have been consulting the Illinois Plumbing Code (2004). I read the thing nearly completely, and did not see a strict requirement for a vent per trap. However, based on the total Fixture Unit value of the installed items (closet...
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    Concern for basement p-trap connection to main line

    Sounds like a backflow preventing valve is the most popular solution on this question. I actually looked at a swing gate type valve this morning and I have to agree it doesn't look foolproof. I will look around for the floating ball variety that was mentioned. Secondly, I will also look into...
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    Concern for basement p-trap connection to main line

    Thanks for the input FloridaOrange. I'm up in Illinois, where in-ground mains are 4" and required to be 1/4" per foot. To clarify my drawing, the object on the east (terminating end) of the line is a septic lift tank (vented). The distance from the closet to the 2" vent is about 3.5'...
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    Concern for basement p-trap connection to main line

    Hello helpers and others like me(in need of help), The attached diagram will explain the general situation but the core question is this: I am concerned there is a possibility of toilet waste making its way into the basement floor p-trap, if the wye it's connected to is in perfect horizontal...
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