How do I convert bathroom plumbing from a single sink to a double sink?
Do I need to go behind the drywall to change out the plumbing or can it be done outside of the wall?
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Everything can be done in the cabinet of the new vanity as long as there is enough room. It will require a little ingenuity on your part. I would use braided steel flexible supply lines. You’ll need measurements, but here you go. Get two short ones 3/8 x 3/8, hook this to the supply stop valve and then to a 3/8 compression tee, then hook your longer supply lines to the tee and then to the faucet these will be 3/8 x 1/2. For the drain you’ll need some kitchen drain parts to make it work. You’ll need (all this is 1 1/2" tubular-compression unions) two p-traps, a tee fitting and probably some extension tubes. Good luck. Contact me directly if you need further assistance.