The 4437964 4437109 Cylinder Seal Kit is an aftermarket product designed for use with John Deere 992D and Hitachi EX800 excavators. Manufactured in China, this seal kit is specifically compatible with these excavator models and makes, providing a reliable solution for sealing and maintaining the cylinder of the machinery. With a focus on quality and precision, this aftermarket part helps ensure the smooth operation and longevity of these heavy equipment machines.