Product details:
Two-way on-off low voltage valves consist of an actuator and valve assembly for controlling the flow of hot water. Features: All models may be installed without disassembling the valve. Compact construction for easy installation. 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. Complete powerhead may be removed or replaced without breaking plumbing line connections or draining the system. Quick Fit pushbutton powerhead makes it easy to remove for service. Series 5000 replacement powerhead is backward compatible with series 1000 zone valves. Innovative motor technology offers silent operation, water hammer resist and longer life.