I currently have a standard washing machine wall box with 2 standard multi-turn boiler water valves. I would like to retrofit a single lever dual-valve shutoff in place of the 2 standard valves.
The house is about 10 years old, but I have no idea if the valves are threaded or soldered in place. I'd have to rip out the drywall around the Washer box to either hold the nut to unscrew the old valves or to be able to unsolder the old valves.
1.) Is this a good idea?
2.) Could a plumber do all this including cutting out the drywall, etc?
3.) What about a no-construction jackleg sort of solution which would be 2 hosepipe-to-1/2"-adapters so that the dual-valve would be installed outside the boiler valves?