Can I change single to double vanity and use double shirt valves on supply lines?

Also, the sinks will be 30 inches apart. So I can drain the second sink as shown?

  • 1
    The fitting in the picture is a sanitary tee, not a wye.
    – Ecnerwal
    May 17, 2023 at 12:14
  • Yes I know. Should I be using a wye?
    – Lance
    May 17, 2023 at 12:34
  • 2
    No, just an observation that the picture you're posting has an incorrect description of what it is. I'd do it using normal double sink fittings before the slip fit entry to drain pipe, as double kitchen sinks are normally done, rather than making the cross-connect with drain pipes and kludging it with a Fernco coupling like that.
    – Ecnerwal
    May 17, 2023 at 13:17
  • 1
    Please don't ask two questions in one post. See How to Ask and take the tour.
    – isherwood
    May 17, 2023 at 13:24
  • Is this about supply lines or drain pipes?
    – gnicko
    May 17, 2023 at 20:03

1 Answer 1


Yes, you can use a double shutoff valve on the hot and cold lines. They make "TEE" fittings that go into a single shutoff and branch off to two sinks. Just make sure you can get braided supply lines long enough to get to both sinks.

Your draining configuration will work too but will take up a lot of room under your vanity. The tail pipes for bathroom sinks are longer than for kitchen sinks so double check your clearances from them to the drain trap.

  • So I don’t need to have a separate shutoff for each faucett and can just use a Tee off of single shutoff valve
    – Lance
    May 17, 2023 at 12:31
  • Tailpeices can (and usually should) be trimmed to fit. Just don't overdo it (they have a range of adjustment in the slip fittings.)
    – Ecnerwal
    May 17, 2023 at 13:12
  • @Lance You can use a Tee but they might be hard to find. It would just screw on to your shutoff valve like a braided supply line.
    – JACK
    May 17, 2023 at 13:26
  • @Ecnerwal The tail pieces also have the stopper that takes up space that the kitchen tail pieces don't have. That's what I was actually referring to.
    – JACK
    May 17, 2023 at 13:30
  • You guys are great. Short of opening the wall and reconfiguring the drain pipes what can I do to take up less room in the vanity? Thanks
    – Lance
    May 17, 2023 at 13:40

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