The quiet and dependable operation has made this valve an industry leader for decades|The manual open lever and twist off head makes installation and service easy|Taco heat motor zone valves provide a convenient way to create individual zones or equipment isolation in a hydronic heating system|Utilizing one pump along with multiple zone valves, flow can be started, stopped, or diverted through the system to provide individual room or area comfort control and energy savings|Taco offers many versions and sizes of the Heat Motor Zone Valve to meet all your zone valve needs|Proven performance millions in use, taco zone valves are the industry's top choice for consistent performance|Rugged dependability|Silent operation|Twist off head|Bellows or globe valve construction ensures positive shut-off and leak proof operation|Patented construction|Easy to install|Manual open (bypass) lever|100% factory tested