Some radiators have square internal plugs, known as square sections, which can be fitted or removed with the square end of a double-ended, Allen or universal key. The other top tapping is fitted with a blanking plug, which simply plugs the hole that would otherwise let out water. There are 4 different sizes and I’ve yet to come across a radiator drain valve that it doesn’t fit. My radiator drain valve keys Universal Radiator Key The problem with this is different tail brands (although the same type of tails) have different sized nuts. So, you’ll need a 16mm, 17mm, and 18mm ratchet spanner to cover them all.

Sometimes, a manual valve or TRV is fitted into one of the top tappings because of the particular design of the radiator. Radiator keys for modern radiators will generally be a standardised size, so you needn’t worry about buying a radiator key that won’t fit. Radiator valve spanner: To avoid bending pipework when radiator valves are being tightened or removed. It’s definitely not an easy job for someone who hasn’t done it before so if you get frustrated easily you should probably call someone in to do it.There is a round hole in the end of the square head that gives clearance for the air vent screw, so the plug can be removed without damaging the screw. The valve tail screws into the tapping, then the valve is connected to the tail with what’s known as a union connection. This is a nut with an olive – a brass ring that gets compressed, forming a seal, as the nut is tightened.

Whether a particular valve is fitted to the left of right side depends on the direction in which the water is to flow through the radiator. For example, you should avoid using pliers. Many people think that these will be a good option as they can easily grip the screw that will open the valve to release the air. However, no matter how careful you are, pliers can damage the screw, which could make it difficult to close the valve again or to bleed the radiators next time you come to do this job. However, instead of external nuts, some valve tails have internal hexagon shapes. These are secured or removed with hexagon-shaped radiator keys. Use some jointing compound on the threads to prevent any leaks (especially if you’re using the old nuts)

Sometimes when having problems with thermostatic radiator valves you can leave the actual valve and just replace the thermostat (or head). Radiator thermostat removed A radiator spanner can mean different things to different people. My radiator spanner keys Radiator Valve Tails Although using water pump pliers to open radiator drain valves is fine, the best radiator drain valve key for me is a small square headed ratchet. My favourite and best tool for valve tails is a step ratchet. They’re so much better, but if you’re not using them often, you might be better off with an Allen key type radiator spanner. The Most Common Tails The valve tail should be really stiff to turn with a tool. If it’s not then it will probably leak, so you should: