A pressure feed nipple ( 5 / pack) to suit the UMS 9-115cc — the nine-cylinder 115cc four-stroke radial from UMS.
On this engine the component is the pressure feed nipple, which provides the crankcase pressure signal that pressurises the fuel tank.
Why this part matters: 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.
Fitting note: Check the nipple is clear and that the tube fits without leaking.
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