Webstone 40443PR 3/4-Inch IPS Isolator EXP Tankless Water Heater Service Valve Kit Includes a residential pressure relief valve (150 PSI/200,000 BTU) 600 WOG 4044 series - IPS Union x IPS 304 Stainless steel wing handle for easy actuation of the main ball Certified to NSF/ANSI 61-8