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The Sievert Self-Seal Butane & Propane Gas Cartridge is fitted with a threaded self sealing safety valve, ensuring safe and easy removal from the appliance and re-sealing automatically. Gas mixture consists of 35% Propane and 65% Butane for optimum performance. All cartridges comply with EN417 Regulations.Size 336gmAdditional Information:• Tool Type: Butane/Propane• Size (g): 336• Fitting: Self-Sealing Valve