SearchAsk us anythingarrow rightDoes one radiator key fit all?A universal key like this can work on tails and radiator sockets, but cannot adjust the valves to bleed.Let's Get It Fixed!Our virtual experts can diagnose your issue (for free!) and resolve simple problems.Chat with a live expertChat nowCall 1 (855) 466-3948Call nowRATESHARECopy linkTwitterFacebookmagnifying glassLink copied to clipboard.SUBMIT AN ANSWERShop Recommended ProductsShop HomeX Recommended ProductsRELATED QUESTIONSCan you get different size radiator keys?The old radiators are obviously imperial and use the size of the watch key. Many of the older ones are the size of 12 keys that is about 4.8mm, the size was simply rounded when they became metrics. If you have an older key (even metric) they usually agree, but for some reason the last ones are not (they also take some wear into consideration).Are all radiator valves the same size?While the total size of each radiator valve can be dependent on aesthetics and type (the thermostatic valves are usually longer), here we talk about mounting dimensions.The 15 mm valves are the only size you can find, since the 15 mm copper tubes are the most common.What size is a radiator Allen key?This key does not match because it is actually 12 inches which is 12.7mm and it is not necessary of 12mm. In the package it is labeled around 12mm which is not the case. I bought an Allen key of 12mm in another place that makes truck.How does a radiator cover fit?However, they are all easy to adjust and involve simply attaching small supports to the wall so that the radiator lid can hang. This allows quick and easy access if you need to bleed the radiator or adjust your temperature.What size is a radiator bleed key?Many of the older ones are the size of key 12 which is about 4.8mm, the size was simply rounded when they became metric. If you have an older key (even metric) they usually agree, but for some reason the more recent ones are not (they also have a bit of wear in consideration). You probably need a size of key 12 clock (4.8mm).