How to connect or union two flexible water supply lines with female connectors of diameters 1/2″ and 3/8″

connectorsfaucetplumbingwater

I was replacing my kitchen faucet when I ran into an issue that I didn't foresee (yes, this is my fault for not looking ahead!). The supply lines attached to the faucet and the supply lines coming from the angle stop do not connect together (two female ends) and are of different sizes. The water supply lines have 1/2 inch female connectors and the lines coming from the faucet have 3/8 inch female connectors. What's more, the supply lines from the angle stop are crimped to the stop and can't be easily removed.

1/2 inch female flexible supply line coming from angle stop
1/2 inch female flexible supply line

3/8 inch female flexible supply line coming from faucet
3/8 inch female flexible supply line

angle stop with crimped supply line (the other end is the 1/2 inch female hex connector)
angle stop with crimped supply line

Now, what I would like to do is connect these supply tubes to each other because there is not an easy way for me to replace the stops, uncrimp the water supply lines, or remove or replace the faucet supply lines.

I believe my question is similar to this one.

Connect 1/2" supply line to 3/8" outer diameter faucet line

Unfortunately, I am unsure of the appropriate diameters to consider when purchasing something because I do not know if the connectors on my lines are NPT (taper) threaded or compression (parallel) threaded.

I have seen there are adapters like compression unions and reducing nipples, but I am unsure of which kind to buy or if there are any for my situation. Another idea I had was to join the two lines using another angle stop, such as the one below, but I am also unsure if that would work or even be a sound solution.

1/2 in. Nominal Compression Inlet x 3/8 in. O.D. Compression Outlet Multi-Turn Angle Valve

Best Answer

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Get 3/8" male to 1/2" male nipple.

Note you need two wrenches and one of these:

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One wrench on the hex nipple, one wrench on the hex female nut, and the pliers above to hold the crimped part of the flexible pipe to prevent it from turning. If the flexible pipe turns, it'll either unscrew from below the socket and you'll get a leak, or it'll bend at awkward angles which will damage the stainless steel weave (that might cause it to burst after a few years) or crush the internal rubber pipe so you get less water flow.

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