A pressure feed nipple to suit the UMS 7-260cc — the seven-cylinder 260cc 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. Supplied as a pack of 4, 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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