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: 8.20 mm (0.322 in)• Groove Diameter: 134.00 mm (5.275 in)• Bore Diameter: 155.0 mm (6.102 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.