A FEW YEARS BACK I SET UP A 6FT TANK WITH PRESSURIZED CO2 INJECTION. I USED A BOC GASES DUAL STAGE REGULATOR $130 AU AND A NUPRO FINE CONTROL VALVE FROM BRISBANE VALVES AND FITTINGS $100AU CO2 SAFE AIRLINE HOME MADE BUBBLE COUNTER AND A DUPLA REACTOR S ITHINK IT WAS CALLED (MANY MOONS AGO). THE TANK OF GAS WAS JUST A SWAP AND GO SET UP FROM BOC GASES WHEN THE TANK WAS NEAR EMPT I SIMPLY WENT AND PICKED UP A FULL ONE BROUGHT IT HOME AND TOOK THE EMPTY ONE BACK. ALL I HAD TO PAY WAS A RENTAL FEE AND FOR 10KG OF CO2 ENOUGH FOR ABOUT A YEAR ON MY LARGE TANK. I STILL HAVE A TANK CYLINDER AND REGULATOR LYING AROUND WILL POST SOME PICTURES SHORTLY......