i had a plumber come in and put in a clothes washer in my kitchen ( i know wierd place for it) he used two inch pipe for stand pipe and p trap which is above the floor then after the trap he went into a sanitary tee with quick vent on the upper side and then straight threw the floor. two feet under he connected it into three inch drain which runs horizontal along wall which serves a water closet up stream. he used a sanitary tee to connect to the 3 inch pipe but i read a few threads on here that see sanitary tees cannot be used on there backs. is this set up going to be a problem.
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