Manual opener for valve operation on power failure; valve returns to automatic position when power is restored</br>May be installed without disassembling the valve</br>Compact construction for easy installation</br>Complete powerhead may be removed or replaced without breaking plumbing line connections or draining the system</br>Actuator motor may be replaced without removing the valve body or draining the system</br></br>Product Description</br></br>Honeywell Electric Zone Valve. Two wire thermostat control with end switch Compact construction for easy installation Actuator motor may be replaced without removing the valve body or draining the system Two-way?? straight-through valve body?? normally closed with end switch Complete power head may be removed or replaced without breaking plumbing line connections or draining the system Electric Zone Valve. HONEYWELL 3/4"4V 4-WIRE 3.5CV. W/TERMINAL BLOCK.</br><br/>http://www.amazon.com/gp/product/B001CLDMROO