Trying to remove leaking shower valve and having hard time. It has a 5//8 hex nut then these concentric circles behind. Tried turning hex, won't budge. Also, If anyone could identify this valve that would be wonderful. Thanks!
Make sure the valve is open before you try to unscrew it.
put the socket on the hex and get a bigger wrench. the longer the handle the more you can put to it.. Don't bust a knuckle or?