KOHLER Toilet Gasket — What It Is, How It Works & Installation Guide

KOHLER toilet gasket, also known as a wax ring, provides a watertight and odor-proof seal between the toilet base and the floor flange. It prevents leaks, blocks sewer gases, and ensures stable toilet installation — an essential part for long-lasting toilet performance.

A KOHLER toilet gasket (commonly called a wax ring) is a crucial sealing component installed between the toilet base and the floor flange. Its purpose is to prevent water leaks, block sewer gases, and ensure the entire toilet system is airtight and hygienic.

What is a Toilet Gasket and Why is It Important?

A toilet gasket seals the joint between the bottom of the toilet and the drain outlet (floor flange). Its key functions include:

• Preventing wastewater leakage onto the bathroom floor

• Blocking unpleasant sewer odors

• Maintaining long-term stability of the toilet installation

• Protecting the floor from mold and water damage

A damaged or misaligned gasket can easily lead to leaks, odor issues, or even floor rot over time.

Choosing the Right KOHLER Gasket/Wax Ring

When selecting a gasket for a KOHLER toilet, keep these points in mind:

✔ Size

Most gaskets are designed to work with 3-inch or 4-inch drain openings. Measure the outlet to ensure compatibility.

✔ Height/Thickness

• Standard ring → when the flange is level with the finished floor

• Extra-thick ring → when the flange sits slightly below the floor level

• Gasket with plastic sleeve → provides better sealing and alignment

✔ Always Use a New Ring

Each time you remove the toilet, replace the gasket. Old wax rings should never be reused.

KOHLER Toilet Gasket Installation — Step-by-Step Guide

1. Turn Off Water & Remove Toilet

• Shut off the water supply

• Flush to empty the tank and bowl

• Disconnect the water hose

• Remove toilet mounting bolts and lift the toilet

2. Remove the Old Wax Ring

• Scrape the old wax off the toilet base and floor flange

• Clean and inspect the flange (replace if cracked or damaged)

• Temporarily cover the drain hole to block odors

3. Prepare the New Gasket

• Choose correct thickness and style

• Place the wax ring on the flange, not on the toilet

• If it includes a plastic sleeve, it should face downward into the drain

4. Set the Toilet in Place

• Carefully lower the toilet straight down

• Align bolts without rocking or twisting the toilet

• Press down gently using body weight to compress the gasket and create a tight seal

5. Tighten Bolts and Reconnect Water

• Tighten bolts evenly (not too tight to avoid cracking the porcelain)

• Connect the water supply

• Turn on water and flush several times to check for leaks

Common Mistakes to Avoid

❌ Reusing the old gasket
❌ Overtightening bolts and cracking the toilet base
❌ Rocking the toilet after setting it on the gasket
❌ Using sealing cement under the toilet base (may cause ceramic cracking)

Final Thoughts

The gasket may seem like a small component, but it is one of the most essential parts of every KOHLER toilet installation. Choosing the correct gasket, installing it properly, and following the best practices not only prevents leaks and odor issues, but also helps maintain your bathroom’s hygiene and structural integrity over the long term.