3/4" Female NPT Inlet X 1" Female NPT Outlet, Set at 20 PSI, 746,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

3/4" Female NPT Inlet X 1" Female NPT Outlet, Set at 30 PSI, 970,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

3/4" Female NPT Inlet X 1" Female NPT Outlet, Set at 45 PSI, 1,306,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

3/4" Female NPT Inlet X 1" Female NPT Outlet, Set at 50 PSI, 1,418,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

3/4"x1" 55#Relf 1,115,000btu

3/4" Female NPT Inlet X 1" Female NPT Outlet, Set at 60 PSI, 1,641,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

3/4" Female NPT Inlet X 1" Female NPT Outlet, Set at 65 PSI, 1,753,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

3/4" Female NPT Inlet X 1" Female NPT Outlet, Set at 70 PSI, 1,865,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve

3/4" Female NPT Inlet X 1" Female NPT Outlet, Set at 75 PSI, 1,977,000 BTU Capacity, Hot Water High Capacity Pressure Relief Valve