Manufacturer Name: Siemens Building Technology Product Number: S55180-A157 OEM Part Number: S55180-A157 Product Description: 24Vac 0-10 Vdc Actuator Nsr Nc Weight:0.75lbs/340.19g Siemens S55180-A157 Zone Valve Actuator is a highly accurate actuator designed to control flow of heating or cooling mediums in HVAC system. This actuator operates at 24V AC/DC, ... https://www.partshnc.com/s55180-a157-siemens-building-technology-24vac-0-10-vdc-actuator-nsr-nc