This adapter/whip must be out there somewhere. Many portable sized 100% medical grade oxygen bottles have the PISS ports (Pin Index Safety System). For those of you who may be unfamiliar with the term, there's one big socket for the regulator to plug into, along with two small holes for the pegs on the regulator. Anyone know if there's an adaptor for that to make a whip to any normal DIN/Yoke tank? I'm trying to do partial pressure filling on the go (on a boat with a compressor for example).