Hw77+7
The adaptor will change the M8, M10 or whatever metric Thread you have to 1/8 bsp that is the standard fittings an a pcp rifle,, If You already have the pump then you may only need the 1/8 bsp quick fill male foster fitting for your probe then it clicks straight into your pumps quick connector.
auction site item number:283864980702 for instance. You can even buy the fill probe for your pcp already made with the foster fitting.
I dont know of anyone who uses spanners to fill their various pcp guns any more,, Especially the guys with lots of rifles as the pcp fill probes are different, Just click in the fill probe for your rifle of your choice and away you go.. I have lots of different probes so quick change is the way to go or muck about with a couple of spanners every time you want change a fill probe. You can get a bag full of foster fittings from china for next to nowt these days.