This is the inlet pipe for the UMS 9-115cc engine, the nine-cylinder 115cc four-stroke radial from UMS.
The part itself is the inlet pipe, feeding the air/fuel charge to the cylinder.
Why it is replaced: a cracked inlet pipe leaks air and leans that cylinder. Supplied as a pack of 10, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Check the flanges and renew the gaskets.
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