House - Toilet Parts K-GP1059291 Canister Flush Valve Seal - 2 Pack
Two yellow K-GP1059291 canister flush valve seals shown together.
Yellow 3.4-inch canister flush valve seal for Kohler toilets.
K-GP1059291 canister flush valve assembly with red rubber seal for toilet repair.
Yellow rubber canister flush valve seal replacement with close-up detail view.
Single yellow K-GP1059291 canister flush valve seal replacement part.
Handyman repairing a toilet to install a K-GP1059291 canister flush valve seal.
Two yellow K-GP1059291 canister flush valve seals shown together.
Yellow 3.4-inch canister flush valve seal for Kohler toilets.
K-GP1059291 canister flush valve assembly with red rubber seal for toilet repair.
Yellow rubber canister flush valve seal replacement with close-up detail view.
Single yellow K-GP1059291 canister flush valve seal replacement part.
Handyman repairing a toilet to install a K-GP1059291 canister flush valve seal.
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K-GP1059291 Canister Flush Valve Seal - 2 Pack

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K-GP1059291 Canister Flush Valve Seal

Key Features

  • Package contains two seals
  • Material: Chemical-resistant silicone
  • Outer Diameter: 3.35 inches (8.5cm)
  • Inner Diameter: 2.6 inches (6.6cm)
  • Replaces original red or yellow colored seals

Replaces / Cross-Reference Part Numbers

  • Kohler: K-GP1059291, GP1059291, 2475620, 1049291
  • Korky: 451

Compatibility & Fitment

  • Fits KOHLER single-flush canister toilets
  • Designed for toilets with Class 5 and Class 6 flush systems
  • Compatible with tank model K-4436

When to Replace

  • Toilet runs constantly or leaks water from the tank into the bowl
  • Flush is weak or incomplete
  • Existing seal is visibly worn, cracked, or warped

Installation Tips

  • Turn off the water supply before installation
  • Flush the toilet to drain the tank completely
  • Remove the canister mechanism to access the seal
  • Clean the valve base and canister surfaces before installing the new seal
  • Ensure the new seal is seated flat and is not twisted
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Product image 2
  • SOLVE LEAKING PROBLEMS

    SOLVE LEAKING PROBLEMS

    The K-GP1059291 Canister Flush Valve Seal addresses leaking issues by providing a tight seal between the flush valve and the toilet tank.
  • REDUCE WATER BILL

    REDUCE WATER BILL

    By replacing the old seal with a new one, the toilet's flushing system operates more efficiently, resulting in a lower water bill for the household.
  • ENHANCED FLUSHING POWER

    ENHANCED FLUSHING POWER

    A new K-GP1059291 Canister Flush Valve Seal enhances flushing power by tightening the flush valve and the toilet tank outlet.
  • SIMPLE INSTALLATION

    SIMPLE INSTALLATION

    BlueStars K-GP1059291 Canister Flush Valve Seal is very simple to install and anyone can do it with no tool required.
ECONOMICAL DIY REPAIR

ECONOMICAL DIY REPAIR

Enjoy the comfort that our K-GP1059291 Canister Flush Valve Seal bring into your toilets - BlueStars provides DIY solutions to help you deal with any trouble!
Material
‎Rubber
Item dimensions L x W x H
‎3.3 x 3.3 x 0.3 inches
Inlet Connection Size
‎1.5 Inches
Inlet Connection Type
‎Compression
Outlet Connection Type
‎Compression
Number of Ports
‎2
Outlet Connection Size
‎1 Centimeters
Part Number
‎K-GP1059291 PO2
Item Weight
‎0.352 ounces
Product Dimensions
‎3.3 x 3.3 x 0.3 inches
Color
‎Yellow
Style
‎Pack of 2
Shape
‎Round
Installation Method
‎Hassle-free Installation
Included Components
‎2 x K-GP1059291 Canister Flush Valve Seal

FAQ

The most common symptom is a toilet that runs intermittently or 'ghost flushes' on its own. If you notice water leaking from the tank into the bowl, or if the tank level drops over time despite no visible leaks on the floor, the seal has likely hardened, cracked, or become coated in mineral deposits, preventing a proper watertight closure.
This seal is designed for Kohler single-flush canister toilets, specifically those utilizing the Class 5 and Class 6 flushing systems. It is commonly used as a replacement for the K-4436 canister assembly.
Replacing the seal is a straightforward task that typically takes 10 to 15 minutes. You do not need any specialized plumbing tools. You will need to turn off the water supply, flush the toilet to drain the tank, and remove the canister assembly by twisting it counter-clockwise. Once the canister is removed, simply slide the old seal off the bottom and replace it with the new one. No tools are required for the seal swap itself.
These seals are subject to constant submersion and exposure to water chemistry. Over time, the material can lose its elasticity, become brittle, or collect mineral buildup from hard water. Once the material is no longer supple enough to create a tight seal against the flush valve seat, water will begin to seep past it.
Yes. When you remove the canister to replace the seal, take a moment to wipe down the flush valve seat—the area inside the tank where the seal rests—with a soft cloth or a non-abrasive sponge. Removing any accumulated mineral deposits or debris from the seat ensures the new seal can create a perfect, leak-free connection immediately.