Upgrade kit for 1 side of the topworks. This kit updates the Seal Heads on your KMT 15-60hp or 100D SL-V, E- and S-Series pumps. Kit includes the new-style, shorter liner and new seal head assembly C0145 (the new version of the the C0089.) After this kit, use C0145 which is this sealing head assembly without the liner. C0123 is the Seal Head Body, and K0197 is just the Repair Kit.