The GEKO G01781 5-step radiator spanner is used to tighten and loosen union nuts, valves and plumbing connections. It covers sizes from 3/8″ to 1″ and features a 1/2″ square drive for use with a compatible ratchet or handle.

Its stepped design is intended for internal union connections and tap extensions. It is suitable for installing and maintaining radiators, radiator valves and plumbing fittings, as well as for accessing confined spaces.