Hi everyone i'm back.
To get this right for skullpop, the converter i sell connects to the dive shop air source, and converts it to a quick release fitting.(air america style, fill nipple) Perfect for filling a paintball bottle/reg from a dive shop compressor, without the need for a dive tank.
Some dive shops are not happy filling paintball bottles, but are happy to use the convertor.
The fill rigs (which i also sell for £30 - £40) are used to fill your paintball bottle/reg from a dive tank, not a dive shop compressor.
You only need a fill rig if you have a dive tank.