Pride Plumbing came out and, after cutting an access in the shower wall, replaced a leaking Pfister bathtub/shower faucet valve with a new Delta R10000-UNBX rough-in valve, added a Delta T13420 chrome trim kit (replacing the shower head, valve cover and handle, overflow cover, and downspout push button diverter) and converted the valve's copper above-floor hot and cold water supply lines to PEX piping and stainless steel fittings; tying them into the building's existing copper main water lines. Finally, we installed a plastic plumbing panel to cover the hole we cut in the wall.