Toilet Replacements Made Easy: How to Find Your Model Number

You shouldn’t need a plumbing degree to replace a toilet flapper. Or a fill valve. Or a flush handle. When your toilet needs a quick fix, the easiest way to get the right parts is by starting with one simple thing: the toilet model number.

Lift the Lid: Where to Find the Model Number

Toilet model numbers are usually stamped or printed in one of two places:

Inside the tank: Look on the back wall or bottom of the tank.

Under the tank lid: Flip it over to check for a number etched or printed there.

Most model numbers are 4–5 digits, sometimes with letters. If it’s hard to read, take a quick photo and zoom in – much easier than squinting!

Here are some of our most popular brands and where you can find the toilet model numbers:

Kohler: Toilet model numbers are usually located inside the tank. For one-piece toilets, the number is inside the tank; for two-piece toilets, it can be found inside both the tank and bowl. Kohler offers details here! 

Mansfield: The toilet model number is stamped inside the tank, often molded into the china or printed on a label inside the tank lid. Mansfield offers a toilet model number guide here. 

Vortens: Look for the toilet model number stamped or molded inside the tank or on the underside of the tank lid. It may also be printed on a label.

Western Pottery: Model numbers are typically stamped or printed inside the tank or on the underside of the lid. You can find out more in this guide! 

Sloan: Toilet model numbers can be found on labels inside the tank or stamped onto components.

Search Smarter: Use the Model Number on SquarePeg

Head to SquarePeg and enter your model number in the search bar. You’ll instantly see compatible parts, including:

Flappers
Fill valves
Flush valves
Trip levers (Flush handles)

Gaskets

Using the model number means no second-guessing and no wasted time with the wrong part. Need help? Our customer support team is happy to lend a hand.