1965 C15 S

[bobby12]

HI,
FIRST BSA I HAVE OWNED.
DOES ANYONE KNOW THE CORRECT THREAD SIZE FOR THIS MODELS PETROL TANK, I AM BEING TOLD VARIOUS SIZES, NEED TO PURCHASE A NEW TAP. Thanks,

[chaz]

probably 1/4 BSP also known as 1/4 Roots or 1/4 Gas

Petrol Tap 1/4" x 3/8" with Extended Plunger. Fitted to BSA C15, early bantams.

[Spaceman]

Many of the plunger petrol taps you can buy seem to come as 3/8 BSP but with an adaptor that can be removed to allow them to also fit a 1/4 BSP petrol tank threaded hole. I believe the C15 tank takes 3/8 BSP.