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I assume the 4" line is being used as the vent, there is no other plumbing in that wall. It's a 5 story building so I have 3 above and 1 below. Layouts of all units are identical so I assume the 4" line is only used for washer discharge (unless someone has added a sink like I plan to). If I...

Thanks hj - there are 3 floors above me and that 4" stack is a common for all laundry rooms in upper/lower units. The existing plumbing setup is how it was done when the building was built in ~1979. I've never had an issue with backup on the washer drain, but I know that doesn't mean it's...

I'm in the process of adding a sink to the laundry room in my condo and would like a double-check on my plan. Here's what the plumbing looks like now: Here's my plan to add the supply/waste lines for the sink: Basically I would cut out the existing sanitary tee on the 4" common...