Perfect Compatibility: Replacement powerhead for Honeywell zone valve motor 40003916-026, replaces 40004850-001 and fits V8043E1000 series including V8043E1012, V8043E1061, V8043E1079 and V8043E1020. Designed for two-way spring-return valves, avoiding full valve replacement and saving significant plumbing costs. Exact Replacement - No Fitment Worries: Engineered as a direct replacement for Honeywell V8043E1012 and other V8043E1000 series zone valves. Matching screw and wire leads ensure simple installation. Fixes Sticking, Grinding and Stripping: Addresses common issues like valves that fail to close, bind, or create grinding noise. Upgraded stripping-resistant gears, reinforced frame and strong return spring deliver positive close every cycle, preventing stuck valves and overheating rooms while keeping temperature balanced throughout the home. Reliable Boiler Ignition with Precision End Switch: Integrated, precision-engineered microswitch with gold-plated contacts provides dependable signal transfer to the boiler. Eliminates intermittent ignition, short cycling and no-heat complaints, helping ensure steady, consistent warmth on cold nights and reducing nuisance troubleshooting calls. Built for Long-Term Reliability: Features a burnout-protected motor and high-cycle-rated internal components to withstand frequent daily operation. Robust construction supports years of use in demanding hydronic heating systems, offering dependable performance season after season and reducing premature failures and replacement frequency. Color: Silver Material: Metal Package Contents: 1*Honeywell Zone Valves