double bathroom sink to 1-1/2' drain?
Is it safe to hook up a double bathroom sink to a 1-1/2" drain? I've had 3 plumbers give me bids on my bathroom remodel. The first two didn't say anything about the drain; and the 3rd one said I would need a 2" drain. I have a plumbing book that says a 1-1/2" should handle 3 units. There will be nothing else in that branch. In fact, the previous arrangement had a single sink and a bathtub going to the exact same drain.