SELF SEALING NOZZLE - UL Listed - Butane Fuel Canisters feature a self-sealing nozzle. This stops the gas from leaking out when not inside a butane camping stove. You do not need to worry about gas leaks FOR USE WITH BUTANE CAMPING STOVES – National Standard Butane Fuel Canisters are designed to be used with Butane Stoves. Please check your stove for Compatibility. NOTCHED COLLAR FOR EASY ALIGNMENT - National Standard Butane Canisters have a notched collar which helps to align the canister inside the camping stove. This helps the user to easily align the canister. MULTI COOKING SESSION CANISTERS - National Standard 8 oz. hold enough butane fuel to be able to last through multiple cooking sessions. Cooking time may vary depending on the model and brand of butane stove Butane Fuel Canisters for Portable Camping Stoves < BR> < BR> SELF SEALING NOZZLE - UL Listed - Butane Fuel Canisters feature a self-sealing nozzle. This stops the gas from leaking out when not inside a butane camping stove. You do not need to worry about gas leaks < BR> < BR> FOR USE WITH BUTANE CAMPING STOVES – National Standard Butane Fuel Canisters are designed to be used with Butane Stoves. Please check your stove for Compatibility. < BR> < BR> NOTCHED COLLAR FOR EASY ALIGNMENT - National Standard Butane Canisters have a notched collar which helps to align the canister inside the camping stove. This helps the user to easily align the canister.   < BR> < BR> MULTI COOKING SESSION CANISTERS - National Standard 8 oz. hold enough butane fuel to be able to last through multiple cooking sessions. Cooking time may vary depending on the model and brand of butane stove < BR> < BR> National Standard Butane Fuel Canisters - when you purchase this product. Each 8 oz. butane canister will burn for approximately 2 hours at high heat and 4 hours at simmer to provide you with all of the cooking power you need.