Description:Piston seal prevents oil transfer between the rod end of the cylinder and the cap end.Attributes:• Rubber seal with plastic ring• Groove Width: 9.63 mm (0.379 in)• Groove Diameter: 116.85 mm (4.600 in)• Bore Diameter: 136.56 mm (5.376 in)Application:Used as needed to service hydraulic cylinder components to keep your equipment leak free. Consult your owner's manual or contact your local Cat Dealer for more information.