Easy Step by Step Guide to Convert Single Drain Pipe into Double Sink

Are you wanting to install a double sink, but only have a single 1 1/4 inch drain pipe coming out of the wall? You could rip the drywall apart and create two drain pipes coming out of the wall for your two things, or you could use this trick using reducer washers.

[@ghislainehiers5359]

Laying a tee on its side for drain usage is automatic fail that is across America. Only time you can lay a tee on side is for venting. Those slinky drains are also bad.

[@MC-kb6zp]

Don’t do this

[@ajsemtb]

Great job! This is exactly what I was looking for! Thank you for sharing the solution. And who cares about code! Seriously! Just because there are reasons why you "shouldn't" doesn't mean 1. you can't, or 2. it won't work. It's just water people! It flows! Not everyone can afford a plumber or has the time to wreck out their walls to "do it right". My house built in the 70's is DEFINITELY not up to current codes, and yet, I take showers, flush the toilets and have sinks that drain just fine. And guess what? I now have 2 sinks that work just fine where I previously had 1. Thanks to this guy! :D

[@ds1755]

Nice idea but I guarantee you if you got this inspected it would fail.

[@yehmustafa2959]

It's going to clog up over time. Guaranteed

[@dennisnolan2544]

That could not be more code incorrect. Real example of how not to do it

[@B.Piercesports]

This is perfect.

[@matthewboyer7156]

Can you provide a “shopping list” for the fittings you put on the supply valves and the reducing washers used?

[@ActinOut]

Pretty sure you needed a y and a studor valve in that drain plumbing.

[@rw2452]

In Canada, that T is a building code fail. You must use two wyes "Y"

[@pedropereira8924]

Very nice thanks for sharing!

[@moneymav9403]

Nice dude

[@blinkythrfosev4812]

Thanks for the detailed size and explanation and keeping it short, simple, and direct to the point. What size are the water lines?

[@medifarahi6953]

Great work

[@NathanThePrezPretlow]

Do they make a dual drain 1 1/4 kit for bathroom sinks.I cant find anything online.?

[@yanivboussiba2787]

You could hand go all the way with 1.5 and use trap adapter 1.5 to 1.25

[@GoNoGoDIY]

How did you put two water source connectors off one source?

[@SaltySoul222]

Is there a reason the P-traps are so low? It takes up all the space under the cabinet. 😬 My drain pipe is 2” and just as low. Do you think it’s possible to ‘T’ upward instead of straight out? Or am I being ridiculous? Thanks.

[@claypalmer91]

Any issue yet? It’s been over a year yea?

[@meyou8141]

Please don't follow this method. The tee is supposed to be vertical. He switched pipe size from 1 1/4 to 1 1/2 and back 1 1/4, you shouldn't drain from bigger to smaller. Those accordion style p-traps are pretty much not code everywhere. Those ridges slow the flow of water and catch everything, they build up with grime and bacteria. 1 1/4 pipe is undersized for 2 vanities. You have the risk of siphoning the p-traps and allowing sewer gases into the home.