The Honeywell V4043 motorised two-port zone valve with a 28 mm compression connection is designed for a variety of flow control applications in domestic and light commercial central heating systems. This valve can be plumbed at any angle, but the powerhead should not be below the horizontal level of the pipework. It is also positioned where it cannot block any vent or cold feed when closed. The V4043 series of two port Motorised Valves has a wide range of flow control applications in domestic and light commercial central heating systems. Motor open with 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. Quiet operation, minimal power consumption. 1m flying lead, head resistant cable requiring a 230V AC power supply. Ambient temperature range from 5 to 50°C. Designed to control the flow of water in iron and copper pipe systems. Although specifically designed for small bore domestic central heating systems, the valve can be used in commercial and industrial applications.