Serviceable Design: Built for veteran technicians with an in-place valve repacking capability to minimize downtime during routine maintenance

utilizing a dual-seat design for safety redundancy

Dual-Function Logic: Manages both the high-limit safety cut-out and the circulator pump relay from a single control point

and water flow monitoring systems

Industrial-Grade Coil: 120V electromagnetic coil designed to withstand high-cycle operations without overheating or premature failure

Watts 0590723 Air Vent Valve R-407A Serviceable Design: Built for veteranThe Watts 0590723 (also known as the FV 4M1 3 4) is a high performance automatic air vent valve engineered for demanding commercial and residential hydronic heating systems. Designed to purge trapped air from hot or cold water distribution lines, this 3 4 inch NPT air vent features a rugged brass body and cover capable of handling system pressures up to 150 psi and operating temperatures reaching 240F. Its high temperature resistant polyethylene float