Radiator valve allen key with slotted end used for tightening and loosening radiator valves. Special 1/2 inch allen hex key spanner designed to install or remove the tails of union type radiator valves that are screwed into a radiator. It is made from high tensile steel and is strong enough to accept sufficient torque and even mild hammering to assist removal of stubborn tails. The end of the key is sized to go inside a standard radiator valve connector tail and it also has recesses to engage internal studs which sometimes exist in the tail. The other end of the tool has a square to remove 1/2 inch square air vents. This radiator spanner has an allen key design for leverage when fitting and removing even the tightest hollow radiator valve connectors and vent plugs. This spanner features a dual-end design to accommodate various radiator components.