This unique radiator spanner manufactured from cast stainless steel fits a multitude of different radiator fittings both imperial and metric patented design no 2295111 fits the following 8mm 12mm radiator valves 8mm radiator valve extension fittings radiator valves with external square and hexagonal type fittings thermostatic radiator valves 12in imperial radiator valves imperial internal lug type valves 12in black iron plugs 12in air vent plugs 12in plastic plugs 11mm 12mm valves metric int