Hi All
It is the nternal bits of the reg that determine what gasses they will work with. ie the materials in diaphram etc can be rubber or metal etc. So may be able to be used and the price is good if the connection can be changed.
The fitting on these is type 10 5/8" RH thread. The CO2 tanks we all use are Type 30 and completely different.
TYPE 10
5/8" BSP RH Internal, 14 T.P.I.
Internal angled sealing face, thread I.D, 21.0mm
Gases: oxygen, helium, argon, non-flammable non-toxic mixtures
James
TYPE 30
0.860" WHIT RH, 14 T.P.I.
Flat end sealing face, thread O.D. 21.8mm
Gases: carbon dioxide, nitrous oxide