The Muncie 49T38553 is a piston cup for CS20 series power take-off units configured with I and Z output options. Muncie’s own service-parts documentation also lists this cup as applicable to CS24 and CS25 PTO models with I, D, and Z output configurations. The piston cup is a shift-rail piston component that enables proper pneumatic actuation within the PTO shift mechanism. If you need help confirming the right cup for your specific PTO model and output configuration, give us a call at Pro Gear and Transmission.FeaturesGenuine Muncie part number 49T38553Piston cup for CS20 PTO shift-rail piston assemblyCompatible with I and Z output configurationsAlso listed in Muncie service documentation for CS24 and CS25 PTO models with I, D, and Z outputsSold individually (each)Used in these Muncie PTO modelsCS20 & CS21 SeriesCS24 & CS25 Series