The Lezyne High-Pressure Floor Pump O-Ring Service Kit includes the parts needed to refresh the performance of a Lezyne CNC, Alloy, Classic, Steel, or Sport series HP Floor Drive Floor Pump. Installing these parts will eliminate blow by and/or leaks in the system and bring the performance of the floor pump back to what it was like when the pump left the factory.
Needed a seal for my Lezyne floor pump it was a Sport FS and fit fine, there is a YouTube video to show how to repair the pump as well from the manufacture.