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KS E20i Oil Pressure Cartridge - 170mm ModelNumber=K6587 }RockShox Glass Fiber Reinforced NylonKS E20i Oil Pressure Cartridge 170mm. Cartridges fully replace the functional mechanism of KS dropper posts. Pick the model and length of drop for the post you need to service. These are also called "Oil Pressure Sticks" and "Air Pressure Sticks" In KS Service Documentation. Fully replace the functional mechanism of KS dropper posts May not work with OEM dropper posts