The Resideo 40003916-021 Replacement Power Head Assembly is intended to replace the power head on the V8043A Series Zone Valve, providing dependable control over your heating system. This assembly operates at 24V and has a frequency of 50Hz or 60Hz, with an 18" lead wire connector for easy installation. https://www.partshnc.com/40003916-021-resideo-hw-v8043a-powerhead-assbly24v