The Blue Point AIR-50 RC40C Piston Ring Compressor is a Snap-on tool designed to compress piston rings for engine assembly, helping rings seat evenly during installation. This RC40C model is specified for piston bores from 2-1/8 in to 5 in, making it suitable for a broad range of automotive engines. The unit is listed under part number 5120-00-250-6055 and is part of the AIR-50 RC40C family.
