For use with high capacity fuel pumps, this assisting operation of carburettor needle valves and preventing excessive fuel overflow.6-8mm tails. Adjustment range 1-10psi. Factory setting 3psi. 67mmFits on: 100-4, 100-6, GT6, HERALD, MGA, MGB, MGC, MIDGET, MINI, MINOR, SPITFIRE, SPRITE, STAG, TA, TB, TC, TD, TF, TR2, TR3, TR3A, TR4, TR4A, TR5, TR6, VITESSE