This is the pressure feed nipple for the UMS 5-180cc engine, the five-cylinder 180cc four-stroke radial from UMS.
The part itself is the pressure feed nipple, which provides the crankcase pressure signal that pressurises the fuel tank.
Why it is replaced: the crankcase pulse is what feeds fuel on a two-stroke-style pressure system, so a blocked or loose nipple leans the mixture at high power. Supplied as a pack of 5, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Check the nipple is clear and that the tube fits without leaking.
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