I’m installing a new bathtub with a one-piece deckmount faucet. 3/4″ rigid copper to within a foot or so of the faucet, and then… Anybody see any problem with using 12″ long 3/4″ braided stainless flexible water heater hookup lines to make the connection from the copper supply to the nipples on the faucet? I have an access panel in the wall directly behind this assembly, and it sure would simplify the install. It seems like a no-brainer to me, but I’m no plumber. Maybe there’s something better…? Thanks in advance….
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One minor problem. The nipples on the faucet are 1/2" Get a pair of adapters, you'll be fine. To save a $ or two, you do know they actually make 1/2" flex line intended to hook up faucets. I'm assuming you're trying for max flow to fill the bath fast?
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The correct method is to plumb all the way to the faucet with copper pipe. Either use thread adapters at the faucet (typical if it's box store stuff) or sweat directly to the brass body of the faucet (if there is a provision for copper to slip inside the brass).
If you have room in the access area add shut off valves (1/4 turn ball type) so the next repair/replace is easier.