Repair your leaking or running American Standard Champion 3, Kohler Class 5, or Kohler Class 6 toilets. The Korky universal 3" valve seal kit contains 2 premium, longest lasting seals to repair your champion, class 5, or class 6 flush valve. Proven longest lasting, the valve seal kit is backed by a 5 year warranty. Replaces: American Standard seal: 738651-0070A & Kohler Seal: GP1059291. Easy to install.