AR65507 Liner Seal Kit Fits John Deere 300/400/PowerTech SeriesOne New Aftermarket Replacement AR65507 Liner Seal Kit (O Ring Kit) Fits John Deere 300 400 PowerTech Series Engines This aftermarket cylinder liner sealing ring kit (o ring kit) provides a secure, leak proof seal between the engine cylinder liner and the cylinder block on Fits John Deere 300 Series, 400 Series, and PowerTech diesel engines. The kit is sold as a single cylinder set and seals against coolant and oil leakage at the liner bore. Fits John