UMS 5-260cc VACCUM TUBE-B ( X 5 PACK)

This is the vaccum tube-b for the UMS 5-260cc engine, the five-cylinder 260cc four-stroke radial from UMS.

The part itself is vacuum tube type B for the induction plumbing.

Why it is replaced: renewed with the rest of the tubing as part of a service, since tubes age at the same rate. Supplied as a pack of 5, which is how these small parts are normally bought — you rarely need just one.

Fitting note: Replace all the tubing at the same time rather than chasing leaks one at a time.