Specification Brand : Five Star Marine BulletPoint1 : Product Name : CopperWasher;Inner Diameter : 38mm/1.5" BulletPoint2 : Outer Diameter : 48mm/1.9";Thickness : 2mm/0.08" BulletPoint3 : Material : Copper;Color : Copper Tone BulletPoint4 : Weight : 11g BulletPoint5 : Package Content : 1 x Copper Washer CustomerPackageType : Standard Packaging ExteriorFinish : Copper ExternallyAssignedProductIdentifier1 : 0785939403022 ExternallyAssignedProductIdentifier2 : 785939403022 ItemDisplayWeight : 2 pounds ItemName : Five Star Marine Cylinder Seal Kit HC4645H HC4648H HC4658H HP4600 FSM131G1-5 Generation 1 ItemPackageDimensions_Height : 7.5946 centimeters ItemPackageDimensions_Length : 0.889 centimeters ItemPackageDimensions_Width : 7.2898 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : mechanical-seals Manufacturer : Five Star Marine Material : Viton MeasurementSystem : Metric MetalType : Copper ModelNumber : US-SA-AJD-118042 NumberOfItems : 1 NumberOfPieces : 1 PartNumber : a14122500ux0590 ProductDescription : This kit fits Generation 1 style units, the difference between Gen1 and Gen2 are the seal styles. Gen1 uses a pressed in wiper seal and the Gen2 uses a recessed dual action wiper seal. If you order the the wrong generation style we will do an exchange for this as it can be difficult to tell what style you have if you are not a hydraulics expert. Sending Pictures of the End caps / Glands to us will help us identify what you have and what you need. This kit rebuilds the standard Sea Star steering Cylinder HC4645H HC4648H HC4658H, we used all Viton seals for this kit as Viton is a super material and costs 15 times more than other NBR or Urethane materials and last 2-3 times as long, Viton was Formulated by Dupont it is a Synthetic Rubber which resists Oxidation, UV Rays, Solvents, Acids and ozone on paper the working life of this material is about 30 years and I would suspect it will last even longer than that. We have gone great lengths to bring better quality parts to the marine industry as we have seen these systems leak within 5 years of being new. Low Quality Urethane Seals Deteriorate Rapidly In The Marine Environment You won't find better seals on the market hands down. These caps never wear out and they can be resealed without any issues. ProductSiteLaunchDate : 2020-11-12T22:36:35.004Z SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1 UnspscCode : 53100000 WasherType : Flat