【Fitment】 This floor jack seal replacement kit is designed for 328.12160 Sears (Craftsman) Floor Jack. Universal kit for all production years. Meet or exceed for OEM specifications. 【Function】 When your hydraulic jack stops working then it's likely a seal has failed. This causes hydraulic fluid to leak out, the pressure to drop, and the jack to stop lifting. Replacing new jack seals can effectively block external air from entering the equipment, maintaining a good sealing environment and improving the lifting efficiency of the jack. 【Superior Material】 .