CTA Tools 2026 Piston Ring Compressor for Diesel Trucks and Tractors is designed to service most diesel truck and tractor engines. It features a ratcheting mechanism with square drive tool to adjust the diameter enlarged crimped edge to prevent compressor from entering cylinder and spring steel construction with double band design. The 2026 has a range of 3-1/2-inches Â 7-inches (89 Â 178-millimeters) and a depth of 6-1/2-inches (165-millimeters). Heavy-duty construction allows for strength and durability. Whether tuning up your Â68 Corvette or changing the oil on a John Deere tractor CTA can supply you with the tools needed to do the job.