I need to remove a faulty diverter valve from my shower. It is an older Sterling model and unfortunately, there is only one hex nut to grab onto (rather than having both a bonnet and packing nut like the H/C stems) and it isn't one of the standard sizes, e.g. 21/32, 27/32, etc. I believe it is 5/8".

I haven't been able to find a socket deep enough to put on it, so I'm wondering if my only option is to cut into the wall from behind. Fortunately it's just a closet, but I'd still rather replace it from the front if possible.

Any ideas? Anybody else run into something similar?

Thanks - Jebber

They do make faucet socket wrenches, (see image) check them out at; Plumbing Tools - Professional socket wrench set(TK-6316) - Trafalgar International Company

These wrenches are designed to get to those pesky nuts that set way back in the wall. Good luck, Tom