The sockets fit the integral external hexagonal nuts of 1/2 inch BSP radiator valves.
The bigger union nut, on the right of the tail shown here, and its olive – a brass ring that compresses to form a watertight seal when the union nut is tightened later – is removed before the tail is driven in with the socket driver.
The olive and union nut are replaced afterwards for coupling the valve to the tail with an adjustable spanner. |