A vaccum tube-a to suit the UMS 5-100cc — the five-cylinder 100cc four-stroke radial from UMS.
On this engine the component is vacuum tube type A for the induction plumbing.
Why this part matters: a consumable tube renewed when perished, which is the usual reason for an air leak on an older radial. Supplied as a pack of 10, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Cut to length squarely so the end seals on the nipple.
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