SIZES: 1/8GAS fits AJS and Matchless MEDIUM 1/4GAS (or BSP) (13,04mm) fits most makes, Norton, Triumph, Enfield, Velocette, Ariel and the last BSA’s LARGE 3/8GAS fits BSA’s pre 1971 We also sell taps and dies in GAS/BSP sizes.
NUGGET OF WISDOM: Don't play with petrol taps. Only use taps when wet. Keep the corks soaked in fuel or they will shrink. Most taps die on the way home in the car.
Nugget of wisdom: don't play with petrol taps. Especially the cork sealed ones are very fragile when dry. Most taps die on the way home in the car... About cork taps. As soon as the fuel evaporates, the corks shrink. That's why we don't take taps back.