DWV Connection – Drain to Vent
I am wondering if this is an incorrect setup for our drain line and its connection to the vent? I have seen multiple posts online that a wye should not be used in this application, but it should be a sanitary tee. For the plumbers in here, can I get confirmation of this? My contractor, who is not using a licensed plumber but operating under the license of one, is adamant this is sufficient. My understanding is the way it’s setup now with the wye could allow for a strong enough siphon to pull water from the trap and allow sewer gas out the “wrong end.” It also appears to almost make an s-trap, but I think that’s debatable.
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