The Central Heating System is usually drained in order to rectify leaks within the pipework. Before attempting any DIY job please consider seeking expert advice from the professionals Chislehurst Plumbers .A Drain Cock starts life as a small brass tap with a square head that can be turned with a small spanner. It can become mishapened by constant spanner use. To find it check the radiator near the front door, it should be part of the pipework in this vicinity. Most radiators have a drain built onto the valve that is a small ribbed pipe that extends down to an angle so that a hose can be connected. Having found the drain, place a bowl or something capable of catching water once the valve is opened and hose connected in order to save the carpet as some water will always escape.Connect the hose to the small ribbed pipe with a jubilee clip to secure it. Run the pipe into the garden or to an external drain remembering that the water in the system is very dirty and then open the valve slowly allowing the water to flow out through the hose ensuring that there are no leaks. Once you are sure there is no water escaping you can then open the valve fully. The system contains a large amount of water so drain it completely waiting until the flow ebbs. Check at your radiators with a bleed key, the sound of air tells you that the system is empty but if water comes from the radiator bleed valves then close the valves and wait until the system has drained completely. A Chislehurst Plumber can carry out this job.Note:A drain cocks are usually fitted to a system and never touched so it therefore can suffer from corrosion of the rubber washer which can cause two effects:1). You open the drain cock and nothing happens because the rubber washer is stuck to the base blocking the opening. A usual remedy is to tighten the valve as tight as you can which should dislodge or disintegrate the washer allowing water to pass.2). The washer is damaged when you open the valve resulting in a leak when you tighten again, so always inspect the washer before you tighten.

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