Review on 🚿 DANCO Shower Volume Control Shut-Off Valve - Chrome 1.6 inch, Pack of 1 (89171): Enhance Your Shower Experience by Keith Baker

The internal threads are too large in diameter, so it screws too deep onto the 1/2" flare fitting and bottoms out before it can tighten the teflon tape (no matter how many Layer Also in this area there is a set screw *exactly* in the wrong place preventing you from simply finding the shower head sealing washer and putting it in there to compensate for the fact that the seal will never seal if they tap the threads to standard depth *and* solving the problems some other reviewers seem to be having, it might be a decent piece, but from the looks of it it just can't work.