2 Plumbing Questions

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1) How do you tell if a drain vent is installed wrong? Should the vent always exit from the top of the sewer drain? The one I am looking at goes down from the drain and thus must have water inside it before it goes up the stack to the roof. Only one vent on the commode in a very small house.

2) I need to replace a "T" connection due to a leak. If I cut the "T" out, the new T will not reach properly and the PVC will not be able to be glued in properly. Is there a longer "T" I can purchase? For example, if the T i cut out is 2" on the T part, can I buy a T with 3" on the T part? That would solve the problem but I cant find one. do they make them or how do i do this?

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