Honeywell V4043H Repair & Conversion Kit — 40003918-006
The Honeywell Home (Resideo) 40003918-006 is an authentic internal overhaul and conversion kit engineered for Honeywell 2-port motorised zone valves. Serving a dual purpose, it replaces worn internal balls, stems, and seals on modern V4043H bodies, and acts as the official mechanical conversion adapter plate allowing modern replacement powerheads (such as 40003916-001) to mount seamlessly onto legacy pre-1987 V4043 or V8083 valve bodies without draining down or repiping the central heating system.
Identification & Technical Guide:
Brand: Honeywell Home / Resideo | MPN: 40003918-006 | Internal Reference: FTB1250 | Application: Internal wet-side rebuild & pre-1987 actuator head conversion | Valve Compatibility: Honeywell V4043, V4043H, and V8083 (22mm and 28mm 2-port zone valves)
Key Features
- Pre-1987 Actuator Conversion: Adapts obsolete round-top / flat-top pre-1987 V4043/V8083 brass bodies so they can accept modern replacement powerheads (40003916-001).
- Resolves Passing & Stiff Valves: Replaces tired rubber balls, spindle shafts, and perished O-ring seals to cure passing heating circuits and jammed motorized actuators.
- Avoids Costly System Repiping: Rebuilds the internal brass body directly in situ, eliminating the need to cut out soldered or compressed pipework connections.
- Comprehensive Hardware Pack: Supplied with replacement brass top plate adapter, internal closing ball and spindle assembly, profile sealing gasket, O-rings, and securing machine screws.
Installation & Compatibility Notes
Actuator Compatibility Check: If your existing valve actuator casing already features a raised bump/indentation on the metal cover, it is already a modern-style post-1987 body. You only require this kit if you are rebuilding worn internal wet components (ball/spindle/seal), not for conversion purposes.
Drain-Down Advice: Replacing the internal ball, spindle, and plate requires isolating and draining the heating system pipework locally down below the valve level. Ensure the internal seating face inside the brass body is cleaned of magnetite sludge before torquing the top plate screws down evenly in an alternating diagonal sequence.
Compatible Associated Spares
- Matching Replacement Powerhead: Honeywell 40003916-001 (2-port V4043H replacement actuator head)
- Replacement Synchronous Motor: Synchronous drive motor 230V for Honeywell zone valves
- Alternative 3-Port Valve Kit: Honeywell 272752A/U (overhaul ball and O-ring kit for V4073A mid-position valves)