1 1/4" Female NPT Inlet X 1 1/2" Female NPT Outlet, Set at 35 PSI, 3,030,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

1 1/4" Female NPT Inlet X 1 1/2" Female NPT Outlet, Set at 40 PSI, 3,343,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

1 1/4" Female NPT Inlet X 1 1/2" Female NPT Outlet, Set at 45 PSI, 3,656,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

1 1/4" Female NPT Inlet X 1 1/2" Female NPT Outlet, Set at 50 PSI, 3,969,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

1 1/4" Female NPT Inlet X 1 1/2" Female NPT Outlet, Set at 55 PSI, 4,283,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

1 1/4" Female NPT Inlet X 1 1/2" Female NPT Outlet, Set at 60 PSI, 4,596,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

1 1/4" Female NPT Inlet X 1 1/2" Female NPT Outlet, Set at 75 PSI, 5,535,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

1 1/4" Female NPT Inlet X 1 1/2" Female NPT Outlet, Set at 80 PSI, 5,849,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

1 1/4" Female NPT Inlet X 1 1/2" Female NPT Outlet, Set at 100 PSI, 7,101,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

1.25X1.5" RELIEF 7728000btu