What Flush Valve Seal Do I Need?

With such a wide variety of toilet flush valves on the market, selecting the correct flush valve replacement seal can be a bit overwhelming, but don't worry, it's a common task you'll need to do every 5-7 years. 

When it's time to replace the flush valve seal, finding the correct one for your specific toilet model is essential. Korky offers a wide variety of replacement seals to cover the most popular models. Simply scroll to find the flush valve that looks like the one in your toilet and we will direct you to the correct replacement for your toilet. 

Does this describe your toilet issue?

Step 1: Identify Your Tower-Style Flush Valve


Repair your leaking or running American Standard Champion 3, Kohler Class Five, or Kohler Class Six toilets. Replaces: American Standard seal: 738651-0070A & Kohler Seal: GP1059291. Korky part: 435



The Fits American Standard Champion 4 and Eljer Titan 4 Flush Valve Seal replaces the original American Standard part: 7301111-0070A and the following tank models: American Standard® Champion® 4 (2004, 2034, 4266, 4272, 4077, 4281), Champion® 4 Max (4215), Champion® Pro (4225), and Eljer® Titan® 4 (4272). Korky part: 450

450 flush valve seal


The Fits AquaSource and other dual flush seal kits containing 3 various sizes of seals designed to fit the following models: AquaSource (T801, EL205, 0400DF), American Standard (4339, 4348, 4349), Glacier Bay (N2316, N243OE, N2420, N2428R-DF, TL-6900-EW) and Mansfield (178). Korky part: 440

440 flush valve seal


The 2X Long Life Toilet Flush Valve Seal Fits Mansfield 210 and 211 is designed to fit both 2" 210 and 211 Mansfield flush valves. Korky part: 427

457 flush valve seal

Toilet Flapper

If your toilet uses a standard toilet flapper, find the correct replacement by using our Toilet Genius Assistant. 

Flapper sizes

Step 2: Install a New Flush Valve Seal

  1. To ensure a clean and dry installation, start by draining the water from your toilet tank.
  2. Grab a bucket and position it beneath the toilet tank to catch any excess water.
  3. Disconnect the water line from the toilet tank and sponge away the remaining water.
  4. Unhook the flush lever from its tower counterpart.
  5. Gently pull the refill tube from the flush tower.
  6. Remove the mounting cap (if needed). 
  7. Lift off the tower.
  8. Replace the seal by stretching the flush valve seal over the flush tower.
  9. Reassemble.
How to Install a Red Rubber Seal Video