The N² cylinder is produced from high strength aluminum alloy 6061-T6. Includes a Sherwood brand GV series valve.Regulation and Inspection: All Seam less aluminum alloy compressed gas cylinders are manufactured in accordance with U.S. DOT 3AL and TC 3ALM requirements.Every cylinder is inspected and tested by a DOT and TC authorized independen t inspection agency.NOTE: Cylinders have DOT approval to be filled with several gas es including NITROGEN BLENDED GAS etc. Check with your local filler or welding supply. Al uminum cylinder with MAXIMUM 1800 PSI ratingCheck if your local gas company will fill 1800 P SI Nitrogen cylinders.- Capacity: 2-1/2 lbs of liquid N²- Carry Handle : No- Empty or Filled: Empty- 1800 PSI- Diameter: 4-1/4"- Height : 13-1/2 "- Weight: 4.3lbs