IK-WV-200-3-TH-LF Noritz 3/4" Threaded Iso Valve Kit with Male 500K Btuh Pressure Relief Valve Lead Free This lead-free sweat isolation valve kit comes equipped with everything required to isolate your tankless unit from the rest of your plumbing. This kit was designed to make tankless installation that much easier! A 500K BTU pressure relief valve is included. Lead Free 3/4 in threaded iso valve kit with male 500K Btuh Pressure Relief Valve For double wall vent systems More product details and specific model numbers are listed in Additional Information below