- Water seal of high temperature resisting material isolates spring working parts from water during relief
- Non mechanical seat-to-disc alignment will not stick or freeze
- Water can't be trapped and sediment can't foul seat
- Bronze body safety relief valves for pressure protection only of all types of hot water heating boiler equipment
- Standard pressure relief setting 30 psi. No. W374AF.Iron body with bronze inlet; 550,000 BTU/Hr. rating.
Watts Series 174A 1 in. Bronze FNPT 40# 250 Relief Valve
Manufacturer Part #: 0275022
Valve Size: Please select