Bell & Gossett 189137 Heat Motors For Comfort-Trol Zone Valves Used On: 109017 CTS-7524 Comfort-Trol Valve .75 IN. Sweat (MCP12) 109037 CTF-10024 Comfort-Trol Valve Flare (MCP12) 109024 CT-24 Comfort-Trol Operator (MCP12) Fits CTS-7524 (109017) Zone Valve, 109054 Operator