The Muncie 18T21675 is a genuine Muncie Power Products sleeve, listed as a service replacement part in Muncie’s own service parts documentation (SP83-06). Sleeves are precision-fit components used in PTO assemblies to maintain correct alignment and engagement between rotating parts. If you are servicing a Muncie PTO unit and need this specific sleeve, call Pro Gear and Transmission to confirm it matches your assembly before ordering.FeaturesGenuine Muncie Power Products service partPart number: 18T21675Listed in Muncie official service parts document SP83-06Designed as a precision replacement sleeve for Muncie PTO unitsCall us to confirm compatibility with your specific PTO assemblyUsed in this Muncie PTO modelRX Series