This Butane Adapter is for nozzle type camping butane canister and EN417 Lindal Valve camping backing canister stoves devices. You can use canister stoves with butane gas fuel canister as a remote camping stove. BUILT-IN SELF-SEALING VALVE: Equipped with a check-valve (self-sealing valve) & O-ring, therefore it won't leak when connect it to gas canister.