Piston Ring - Sparex Part S.8929Piston Ring Compressor S. 8929 Introducing the Piston Ring Compressor S. 8929, a must have tool for any automotive enthusiast or professional mechanic. This high quality compressor is designed to gently compress piston rings into position, significantly reducing the risk of damage to engine components during installation. Featuring a key operated mechanism with a reliable ratchet system and a built in safety valve, this compressor ensures safe and