Petrol tap thread

[chrisx1]

Apologies if I have asked this before but what is the petrol tank thread size on a A65.
I want to purchase a couple of aftermarket fuel taps as I only have one tap fitted at the moment and I thought as everyone seems to have leaks with the original push pull ones, I would fit something else.

[chrisx1]

The thread seems to be 19tpi and dia is larger than 5/8” but smaller than 3/4” so about 17mm in new money. It must be a bpt I guess.

[iansoady]

It'll be BSP (British Standard Pipe). Don't be confused by the nominal diameter which relates to the bore of the (gas) pipe it's intended for.  1/8 BSP has an overall diameter of about 3/8", 1/4 BSP has a diameter of just over 1/2". It's BSP parallel as opposed to BSP tapered which can sometimes be found.

[Allan G]

It'll be 1/4 BSP or 3/8 BSP depending on which A65 tank it is. However if you buy 1/4 BSP taps (which are more common) and they are too small, B&Q sell adaptors in the plumbing section for 50p or a £1 a chuck, same thing as classic bike parts sellers are advertising at £5 or more each.

[chrisx1]

Thanks guys.

[Rob Neal]

The taps I bought needed thread adaptors to fit the tank.  From memory it was 3/8 - 1/4 BSP parallel threads.  BSP being available in tapered form as well of course.  Don't bother with the usual bike spares suppliers.  Go to your local plumbing supplier and they sell nice brass ones and mine cost 79p each!