How to Install Toilet Wax Ring Without Leaks (Step by Step)

Quick answer: How to install toilet wax ring, in short: the whole job is about one clean, single placement. Shut off and drain the toilet, lift it off, and scrape every bit of old wax from the flange. Check flange height, fit new T-bolts, press a fresh ring onto the toilet’s outlet, then lower the bowl straight down, press it with your body weight, and tighten the nuts snug, not hard.

Kohler’s installation guide puts it bluntly: once the bowl is placed, don’t lift or rock it. If you break that watertight seal, you start over with a new ring.

So my advice is to prep slowly and set once. Everything before lowering is about making that single placement count. When I read Kohler’s and Oatey’s instructions together, nearly every warning traces back to movement after the bowl touches wax.

What You’ll Need

• New wax ring (standard or extra-thick, depending on flange height)
• New 5/16 inch (about 8 mm) T-bolts with nuts and washers; Kohler lists these
• Putty knife for scraping old wax
• Adjustable wrench or 1/2 inch nut driver
• Sponge, bucket and old towels
• An old rag to plug the drain
• Small hacksaw for trimming bolts
• Gloves, plus a helper; one Kohler guide says to lift toilets with 2 people

Check the room temperature too. One Kohler guide warns against installing a wax ring gasket below 69.8°F (21°C). My read: cold wax is stiffer and harder to squash evenly, so warm the room first in winter.

How to Install Toilet Wax Ring, Step by Step

1. Shut off water. Close the supply valve behind the toilet, then flush to empty the tank.
2. Sponge out leftover water from tank and bowl so nothing spills when you tip it.
3. Disconnect the supply line at the tank.
4. Remove the nuts from the floor bolts and lift the toilet straight up. Set it on its side on old towels or cardboard.
5. Plug the flange. Kohler cautions that sewer gases can escape, so stuff a rag in the opening if you won’t reinstall right away.
6. Scrape off all old wax from the flange with a putty knife. Clean the toilet’s outlet horn too.
7. Inspect the flange. Look for cracks, rust or a broken bolt slot. Oatey says to check flange condition and height whenever a ring leaks.
8. Pick your ring. Oatey says a regular ring works best when the flange sits on top of the finished floor. If it sits below floor level, use an extra-thick ring or flange spacers. Oatey’s MaxWax extra-thick ring holds 40% more wax than its standard one.
9. Fit new T-bolts. Kohler has you replace old bolts with new 5/16 inch T-bolts.
10. Press the ring onto the toilet. With the toilet lying on a padded surface, Kohler says to firmly press a new wax seal around the outlet. If your ring has a plastic sleeve, Kohler says the sleeve faces the drain hole.
11. Pull the rag, then align the bowl over the flange and bolts and lower it straight down.
12. Set the seal. Kohler says to apply your full body weight around the toilet. Don’t lift or rock it after this.
13. Tighten the nuts carefully. Add bolt cap bases, washers and nuts. I’d alternate sides a little at a time. Kohler warns that overtightening may crack or chip the china.
14. Trim the bolts. If they stick up 1/4 inch (6 mm) or more above the nut, Kohler says to cut off the excess, then snap on the caps.
15. Reconnect and test. Open the supply valve slowly, flush several times, and check every connection. Kohler says to check for leaks periodically for several days.

Mistakes to Avoid

Honestly, each of these five traces back to a manufacturer warning. None takes skill to avoid, just patience.

• Reusing an old ring. Oatey calls wax rings single-use. Once compressed, they can’t reseal.
• Stacking two rings. Oatey doesn’t recommend it. Use one extra-thick ring or a spacer kit.
• Test-fitting the bowl. Lowering it to check alignment, then lifting it again, ruins the ring. Line up the bolts by eye first.
• Cranking the nuts. Snug is enough. A cracked base means a new toilet.
• Cementing the base. One Kohler guide warns not to use cement to seal the foot of the bowl to the floor, since it can damage the product and void the warranty.

The trick on step 11 is to drop the bowl straight onto both bolts in one move. I’d stand over it, straddle it if needed, and look down through those bolt holes as it lowers.

Don’t rush it. In practice, a helper calling out “left, left, good” saves a ring.

When to Call a Plumber

Call a licensed plumber if the flange is cracked, rotted or broken, if the floor around the toilet feels soft, or if the shutoff valve won’t close. A soft floor means water has been getting in for a while, and the subfloor may need repair before any ring will hold.

Wondering whether yours needs replacing at all? Read how long does a toilet wax ring last.

Retiling the floor while the toilet is up? See what size grout line for 12x24 tile, and browse more bathroom remodel guides.

Frequently Asked Questions

Should the wax ring go on the toilet or the flange?

Kohler’s guides have you press it onto the toilet’s outlet with the toilet lying on its side. If your toilet or ring came with different instructions, follow those.

Do I need an extra-thick wax ring?

Only if the flange sits below the finished floor, for example after new tile raised the floor. Oatey recommends an extra-thick ring or flange spacers there.

Can I sit on the toilet right after installing a wax ring?

Kohler has you put your full body weight on it to set the seal, so yes. Then reconnect the water, flush several times and watch for leaks over the next few days.

Why is my toilet still rocking after a new wax ring?

The floor may be uneven, or the flange may be loose or broken. Don’t fix a rocking toilet by overtightening the bolts. Check the flange, and level the base before resetting with a new ring.

Last updated: November 10, 2026. Sources: Kohler toilet installation guide 1020805 (PDF), Kohler toilet installation instructions 1587211 (PDF) and Oatey 101: wax rings.