Set of four O-Rings of two different types, for older and newer Primus stoves - one sort also fits Jetboil stoves. This set contains:
2 x O-Ring 888006: This a thinner and slightly larger O-Ring that fits the gas canister screw-threaded connector on older Primus stoves.
2 x O-Ring 888506: This is a chubbier but smaller O-Ring and fits the gas canister screw-threaded connector on all modern Primus Gas Stoves. It also works with the current (2009) models of Jet Boil stoves as the stove element is made by Primus.