Help me find 1/4" npt female to 1/8" male bsp adaptor

North Shore doesn't sell BSPP fittings if I remember correctly.

Just buy a 1/4" NPT to 1/8" NPT thread reducer adapter and then buy a quick disconnect female fitting. You'll have no trouble finding a 1/8" BSPP to male quick disconnect adapter at any decent air gun store. 

I could never find any reasonably priced NPT to BSPP adapters from reliable sources. You could try PCP tunes. If they don't sell one, they can make it for you but, if it is for using a probe with your fill adapter, you'll have a much easier life with quick disconnect fittings instead.

you don't want to have to mess around with plumbers tape every time you charge your air gun.