A Cat® Sleeve is a tube of material that is put into a cylindrical bore, for example, to reduce the diameter of the bore or to line it with a different material. To give it more strength it is designed using Ultra High Molecular Weight Polyethylene (UHMWPE). Sleeves are specifically designed to operate as a system to deliver the performance you expect. Caterpillar design engineers match the right combination of dimensions, materials, surface finish, and manufacturing processes, to each part to enable them to work and wear effectively with all the other neighboring and dependent parts.Application:Consult your owner’s manual or contact your local Cat Dealer for more information.