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Thom
Can I run a 3" main drain from on one side of my trailer and install a 3" to 1 1/2 " tee to vent up and out the existing roof vent hole. The 3" pipe will contine back were it will drain to the...

I have a 1979 Airstream travel trailer that I want to install standard house plumbing, fixtures,drain and venting. The trailer has one hole in the roof that appears to have been a vent hole at one...