Features 1.Versatile Seal Kit: Perfectly designed for 4.0in Bore X 1.75in Rod Cylinder. Use this kit for repair or maintenance of your hydraulic log splitter. 2.Reliable Repair Tool: Facilitates an efficient cylinder rebuild with this premium hydraulic cylinder rebuild seal kit. Enhances the durability and functioning of your log splitter. 3.Premium Material: Made of high strength rubber and plastic material, the hydraulic log splitter cylinder rebuild seal kit ensures long lasting reliability and durability for smoother operation after rebuilding. 4.Easy Installation: The cylinder rebuild kit designed for simple and straightforward installation. No complicated tools and steps are required for hassle free installation. 5.Excellent Performance: The cylinder rebuild seal tool ensures your hydraulic log splitter cylinder operates at its maximum capacity. Experience smoother and effective performance. Specification Item Type: Cylinder Rebuild Seal KitMaterial: Rubber, PlasticFitment: Suitable for 4.0in Bore x 1.75in rod cylinder.The seal kit is used to rebuilt for Speeco design or compatible other brand cylinders such as for Husky, for Split Master, for Oregon, for Dirty Hands tool and after marker cylinders made with same for Speeco design (but might be not suitable for your 20 years or older design). Size:To know whether it fits your cylinder, one way is to disassemble and measure your cylinder to compare with each item information. 1. Cylinder tube bore (I.D.) 4.0in x rod (O.D) 1.75in. 4.0in bore size is not Cylinder tube O.D. Cylinder rod size is inside tube part size. Some factory makes rod having different O.D between inside tube part and outside tube part.2.Piston wear ring (drawing item 16): 101.6 mm (OD 4.0in) x 95.25mm (3.8in) x 9.5mm (0.375in wide)Rod wear ring (drawing item 15): 44.5mm (ID 1.752in) x 50.8mm (OD 2in) x 9.53mm (0.375in wide)3. Piston seals (drawing item 14)1 square ring and 1 O ring. Piston Square ring: 101.6 mm x91.6mm x 3.28mm / 4 x 3.6 x 0.1in, O ring (installed under the square ring): 103mm x 2.65mm / 4.1 x 0.1in. CPU + NBR4. Rod O ring (item 13): 44.5mm x 54mm x 5mm / 1.8 x 2.1 x 0.2in, CPU. There is O ring inside. It is a compound seal ring to ensure better seal and longer life. It is one of most important seals to prevent oil leakage.5. Rod dust ring (Item 12): 44.5mm x 54mm 5.5mm /7.3mm / 1.8 x 2.1 x 0.2in / 0.3in, TPU6. Rod and piston assembly O ring (item 19): 26.5mm x 2.65mm / 1 x 0.1in, NBR. in mots case, this seal might not be needed to replace. This seal might be different size on some after market model. We add one common size 25mm X 3.55mm / 1 x 0.1in as extra. It is standard O ring. If our 2 O rings are not the size with your cylinder, you can easily find it at any local store, such as Home Depot.7. Gland O ring (item 17): 92.5mm x 5.3mm / 3.6 x 0.2in, NBR and Gland Back up ring (Item 18): 101.6mm x 93mm x 1.5mm / 4 x 3.7 x 0.1in, PIFE. The backup ring is support O ring to against pressure, so it will be installed at outside of O ring. See drawing for position. It is one of most important seals to prevent oil leakage.8. Steel wire spring (item 8): it is option item for your cylinder rebuild. You might not need it to replace your old one if it is not damaged during disassembly. Please be sure if our wire ring OD is not same with your old one, please dont use it. Cylinder Size:Below is 4.0in bore x 1.75in rod cylinder size that OEM made by this seal kit:Retracted (center to center between rod mountain hole and clevis hole): 82.3cm / 32.4inExtended (center to center same as above): 143.26cm / 56.4inStroke: 240.05inDimension from center of clevis hole to back face of cylinder: 7.49cm / 2.95inDimension from center of rod end hole to front face of rod: 2.69cm / 1.06inDimension from center of rod end hole to front face of cylinder: 3cm / 1.18inPorts: NPTDimension from port to port: 64.52cm / 25.4inRod: 4.45cm / 1.75in rodRod end mountain hole: 1.4cm / 0.55inClevis Mountain hole: 2.95cm / 1.16inDimension between mountain clevis to clevis: 2.21cm / 0.87inThickness of each mountain clevis: 0.95cm / 0.375inLength of each mounting clevis: 10.48cm / 4.125inPorts are positioned 45 degrees from maintaining clevis positioned verticalMaximum operation pressure: 3500PSI Package List 1 xCylinderRebuildSealKit (10Pcs)