Matco-Norca’s tankless water heater isolation valve kit is now available in three new configurations; press, PEX and cold expansion PEX. The TWHK brass ball valve kits consist of one cold valve, one hot valve and one pressure relief valve. Each assembly features a full port quarter turn valve design and integral hose end drain valves with purge port. These kits are available with a double o-ring stem seal and are NSF372, NSF61, cUPC & IAPMO approved. Isolation valve kits facilitate an efficient installation and effortless maintenance on your tankless water heater.