Steve: Would like info on the CO2 cylinder supplier...i'd like to move to a tank setup. Shawn Keslar, Chemist Nat'l Res. Ctr. for Coal and Energy Analytical Laboratory PO Box 6064 Morgantown WV 26506-6064 304 293 2867 x 5472 FAX 304 293 3749 skeslar at wvu_edu