The ESi Controls 3 port motorised zone valves are easy-fit, with a simple clip on/off detachable actuator head and detachable cable. The actuator has been designed to fit directly onto the valve body used by the market leader, and similar type bodies, with the two supplied screws – making it a quick-fit direct replacement for most households. The spring return valves have been designed to be used in light commercial, industrial and domestic central heating systems which, when correctly wired with an appropriate room thermostat, cylinder thermostat and programmer, will control the water flow from the boiler to hot water, and from the boiler to ‘central heating’. The ESZV223p offer the consumer and installer peace of mind and are focused on value, quality and simplicity, offering an economical and durable solution for households. A direct replacement for the market leader Quiet operation, minimum power usage Replacement actuator head and motor available and easy to exchange Spring return action Manual lever for filling/draining the system Complete with detachable lead Quick and easy to install http://www.esicontrols.co.uk/eszv223p.html