I have a paintball tank which is a 72 ci 3000psi tank and a fill station that goes on a YOKE valve. We have a tank with a SCBA valve on it so we need an adapter that can go from the SCBA valve to a YOKE valve to put the fill station on. And yes, once I can get a tank that has a YOKE valve I can and have filled the small paintball tank off of it before.