SCUBA tanks have to be visually inspected once a year, which involves dumping all of the air from them. I have several here which are full, and will require an inspection in the Spring. My dad taught me to shudder at waste, so I wonder if it's possible to use these in the shop as a compressor? I'm thinking about putting a hose on the regulator's second stage, which would give a couple of hundred PSI. (Some catalog, I can't remember which, advertises a CO2 tank, smaller than a SCUBA tank, which they claim will drive several thousand nails per fill).

Question is: does anyone know of a hose that goes to a second stage on one end, and to a standard air fitting on the other?