Primus P-220693 100gram Power Gas Cannister 3.5oz Primus is dedicated to the hunter and outdoor enthusiast in providing products with the quality or high performance they expect Capacity: 225 g and 450 g liquid gas respectively. Energy content in the larger cartridge is the equivalent of about 1 liter of methylated spirits, sufficient to boil about 30 liters of water. Patented self-sealing valve and standard thread.