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converting singlewall drain to dual bath sinks.
Author: Enegnodnarb (NC) We are changing our single bath sink to dual sinks. House is plumbed with one each hot and cold supply line and one drain outlet in wall. Have supply line problem solved with T fittings ( I hope). Have not found way to hook up two 1 & 1/4 in. drains to single outlet. Any ideas would be appreciated.Thnx.

Re: converting singlewall drain to dual bath sinks.
Author: SwimRunPlumb (MI) It depends if you currently have a drain/vent coming vertically up the wall, and then a horizontal "dirty arm" coming across for the lavatory stubbed out, or if it is coming up through the bottom of the cabinet?

Re: converting singlewall drain to dual bath sinks.
Author: hj No good way to answer until you remove the cabinet and see HOW the existing sink drain is installed.

Re: converting singlewall drain to dual bath sinks.

Author: waukeshaplumbing (WI)

the correct way to do it is to open the wall up and redo the drain and water lines

without opening up walls anything your doing is rigging

the drain can be split in various ways depending on the existing piping in the walls...most likely a 3x 1 1/2 double Y or a 2 x 1 1/2 double Y will be what you need

if you have back to bath bathrooms you may already have an extra lav running into the drain pipe...in that case you may not be able to legally add a 2nd lav to the bathroom without running a completely new drain from the basement...

its not really a homeowner project...id hire a plumber...probably a 3 hour job at the most and it will be correct

rig it now and you'll just have to redo it later some day when it fails a home inspection in order to sell your house.....i see these things every week