GP-THC-CO2-... THC Span, 75 ppm v/v nominal CH4 in CO2 balance, approx. 260 psig, 12.495L Int Vol (Scotty 221), 209L useable gas to 14.7 psig residual, 3 yr exp., DIMS: 8.5 in W (21.6 cm) x 17 in Ht (43.2 cm), 6.3 lbs (2.8 kg), Steel Cyl - Brass valve, CGA-165 with 1/4_ SAE flare 45, DOT 39NCR, DISPOSABLE CYLINDER. Recommended Pressure Regulator = PR-20 CGA-165, cylinder stand = NA. (2014)