Mini short neck 'recovery' radiator cap (suits new the 2/3/4 cores)
RC50-13 Short neck recovery cap
This is used when you use a 'recovery' (that is the radiator blows out hot coolant to another bottle from the side of the filler neck, it then recovers/sucks in the coolant when the car is cold) this cap MUST have a recovery tank on the cooling system.
