About This Threading Compatibility: 3/4 inch NPT female thread (inlet and outlet) - suitable for most household water heaters not exceeding 40 gallons. Compatible with electric, gas water heaters, and tankless water heaters Premium Materials: Lead-free copper body meets NSF-61 standards for potable water. Stainless steel spring mechanism ensures durable, corrosion-resistant operation for extended service life Performance Specifications: Maximum heat input value 205,000 BTU/HR. Calibrated to open and release pressure when system pressure reaches 150 PSI for optimal safety protection Installation Requirements: Vertical mount required with inlet marked for proper orientation. Valve only - installation hardware sold separately. Professional installation recommended for safety Safety & Certification: CSA LISTED for quality assurance. Designed to protect water heating systems from excessive pressure buildup. Safe and leak-free operation when properly installed Overview Material : Copper, Stainless Steel Brand : VAV Item dimensions L x W x H : 7 x 6 x 5 inches Exterior Finish : Copper,Stainless Steel Inlet Connection Size : 0.75 Inches Inlet Connection Type : 3/4 NPT Outlet Connection Type : 3/4NPT Maximum Operating Pressure : 150 Pound per Square Inch Number of Ports : 2 Outlet Connection Size : 0.75 Inches