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I'm remodeling a bathroom in a house built in 1993 (Midwest USA). Apparently the plumbers didn't add shutoff valves under the main or master bathroom sinks... I've found plenty of instructions online for how to add a compression shutoff valve, but the plumbing under the sink goes from CPVC to copper, so I'm not sure if I should really install the fitting on the copper.

My question is; Should I install the shutoff on the copper?

Or should I use a CPVC specific shutoff and take the copper off completely?

My impression is that installing a compression fitting on the copper would be easier, but I don't know if that would be up to code in this situation.

plumbing under vanity sink

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I would leave the copper attached to the CPVC, if taint broke don't fix it.

I would cut it down a little so your new valves are not so high, just below the drain pipe. You can use compression, solder or push to connect valves for 1/2" copper.

I would add support for the pipes, put a piece of wood horizontal on the wall and use copper pipe standoff's or straps to secure the pipes and keep them from flexing when using the valves.

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  • Good advice, especially the bracing. Last thing you want is to worry about ripping it to pieces as you try to turn that stubborn little valve 10 years from now.
    – DonBoitnott
    Commented Apr 1, 2021 at 16:04

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