This is the y-connector for the UMS 7-360cc engine, the seven-cylinder 360cc four-stroke radial from UMS.
The part itself is the Y connector that splits one vacuum or pressure line into two.
Why it is replaced: replaced when the barbs are damaged or the connector cracks, either of which causes a leak that affects two cylinders at once. Supplied as a pack of 2, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Make sure the tube is pushed fully past the barb on all three legs.
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