The Cap/Injector/Relief Valves Spare Kit from Youngs contains a white outlet rubber for the brass valve and all the other seals and \'O\' rings required to refurbish a 4 or 2 inch barrel cap. It is also for use with a King Keg 4 inch cap or Basic Barrel 2 inch cap, it includes spare washers and seals for the Youngs pressure barrel. Cap/Injector/Relief Valves Spare Kit Features Youngs Cap/Injector/Relief Valves Spare Kit/4758 Includes spare washers and seals for the Youngs pressure barrel White outlet rubber for brass valve, seals & \'O\' rings Youngs\' Ref. MPN: 4758Colour: White and BlackSizes: One SizePM Ref: 587866