Does this valve require an external pressure tap for testing

Key Benefits Direct OEM Replacement: Fully compatible with Lochinvar and A

including the 143-80-1

High Torque Performance: The 3 horsepower output efficiently manages the resistance of heavy-duty belt-drive fans to maintain consistent CFM across large ductwork

Always use genuine Reznor components

Watts 0274596 Valve R-407A Does this valve require anThe Watts 0274596 is a 3 4 inch Model 174A 70 ASME rated pressure relief valve designed specifically for protection against excessive pressure in water heating and storage applications. Engineered for closed loop systems, this hot water boiler relief valve features a high capacity BTU hr rating to ensure rapid pressure discharge when system limits are exceeded. The valve is factory set at 70 PSI, providing a reliable safety threshold for high pressure