Honeywell V4043H Motorised Zone Valve - 28mm The Honeywell V4043 series of two port Motorised Valves has a wide range of flow control applications in domestic and light commercial central heating systems. The V4043H valve has been designed to control the flow of water in iron and copper pipe systems. Although specifically designed for small bore central heating systems, the valve can be used in commercial and industrial applications. Key Features and Benefits: 28mm Motorised Zone Valve Motor Open Spring Return Action Manual Lever for Filling & Draining the System Powerhead Replaceable without Draining Down Potential Free End Switch for Electrical Control of Pump and/or Boiler SPDT End Switch, 8.6 KV, 0.45 Bar Max Differential Pressure Height: 94mm Width: 130mm Depth: 152mm Manufacturers 1 Year Guarantee