Honeywell 661680 Honeywell Zone Valve for Gas Connectors

2-way on-off low voltage valves consist of an actuator and valve assembly for controlling the flow of hot water. Manual opener (on all models, except straight-through, normally open valves) for valve operation on power failure; valve returns to automatic position when power is restored. All models may be installed without disassembling the valve.Compact construction for easy installationComplete powerhead may be removed or replaced without breaking plumbing line connections or draining the systemActuator motor may be replaced without removing the valve body or draining the systemUse this valve in closed loop hydronic systems that do not contain dissolved oxygen in system water, such as fresh water from frequent source of makeup water