Champion P09923A Unloader Piston And O Ring Kit

Champion P09923A Unloader Piston and P02547A O-Ring Kit is a replacement set for the unloader assembly in Champion R-series air compressors, pairing the unloader piston (P09923A) with the P02547A O-ring. The kit is used to service the unloader valve in Champion’s R-series two-stage units and is listed in Champion maintenance literature as the components of the unloader kit (unloader piston P09923A and O-ring P02547A). The unloader piston operates with the unloader valve to vent the compressor head during unloading, reducing motor load during restart and allowing depressurization of the head before re-engagement. The P02547A O-ring provides a seal between the piston and its housing, helping prevent air leaks that can affect unloading performance and start-up consistency. This combination is intended for maintenance on Champion R-series models such as the R15B two-stage configuration, ensuring compatibility with the original unloader geometry and seal arrangement. Use this kit when replacing worn or damaged parts in the unloader section to restore reliable unloading function and maintain proper air delivery in compatible Champion compressors.