Replacement o-ring carburettor for the UMS 7-77cc, the seven-cylinder 77cc four-stroke radial from UMS.
Function: it is the carburettor O-ring, sealing a joint or a needle seat within the carburettor.
The reason this ends up on an order: a hardened O-ring is a fuel leak or an air leak waiting to happen, and both upset the mixture. Supplied as a pack of 10, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Use a fuel-resistant O-ring of the correct size and wet it with fuel, not oil, before assembly.
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