The Taco 555-050RP Zone Valve Power Head with End Switch is an electrically controlled device used in hydronic heating and cooling systems. It manages water flow within specific zones of the system. The power head features an integrated pressure regulator that maintains a consistent pressure of 30 psi throughout the zone, ensuring optimal performance. https://www.partshnc.com/555-050rp-taco-zonevlvpowerheadwendswitch24v