I am installing a 1/2" ball valve shut off on my kitchen sink faucet. I'm using a shutoff valve that is barbed on one end for PEX and threaded on the other for the braided faucet lines. After hooking it up, the threaded connection leaks like mad! It looks like it is because the manufacturer of the faucet has a weird fittings on their braided lines - the fittings have 2 sides milled off. So the water leaks from these milled off sides, instead of sealing at the threads. Do I need to use another style of shutoff? Surely I don't need to replace the braided lines...

Thanks for your time and help.
~Stuart

make sure the washer is actually still in the compression adapter - the threads are NOT the seal point

or

? foreign faucet with metric threads ?

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638



Edited 3 times.

As he said, the threads don't seal, it is the smooth rim of the brass that seats onto the faucet supply that makes the joint by compression. I actually like the companies that changed their brass to that style, it is easier to hold the connection while you attach the supply, and nobody can be foolish enough to try putting a bunch of dope or tape on the threads……..

Please post a picture of the valve and faucet supply hose.