Will the Korky 100BP fit every toilet?
No. It requires a standard 2-inch flush-valve opening and does not fit 3-inch valves or canister-style mechanisms.
The measurement
Standard 2 in flush valves
1.28–5 GPF · adjustable · tank-model fit list
Adjustable 2-inch toilet flapper
Standard 2 in flush valves
$8.79
1.28–5 GPF · adjustable · tank-model fit list
- Flush-valve opening2 in
- Supported flush volumes1.28, 1.6, 3.5 and 5 gal/flush
- American Standard tank fitsCadet 4029, 4078, 4083, 4053 and 4650; Evolution 2 Flowise 4061; Monarch 4003; Mainstream 4061
- Kohler tank fitsWellworth K-4620, K-4512 and K-4519; Portrait K-4590
Ships from a US warehouse in 5 days. Shipping to the United States is included. Shipping details.
One genuine Korky 100BP adjustable flapper for standard 2-inch toilet flush valves. Its settings cover 1.28, 1.6, 3.5 and 5 gallon-per-flush toilets. Verify the tank number and valve opening before ordering; this flapper does not fit 3-inch valves or canister-style mechanisms.
The fit
Standard 2 in flush valves
- Flush-valve opening2 in
- Supported flush volumes1.28, 1.6, 3.5 and 5 gal/flush
- American Standard tank fitsCadet 4029, 4078, 4083, 4053 and 4650; Evolution 2 Flowise 4061; Monarch 4003; Mainstream 4061
- Kohler tank fitsWellworth K-4620, K-4512 and K-4519; Portrait K-4590
Illustration based on the product photo. Use the measurements written on this page.
Measurements
Adjustable 2-inch toilet flapper is listed for 1.28–5 gpf · adjustable · tank-model fit list. Compare every deciding measurement below with your space before ordering.
| Flush-valve opening | 2 in |
|---|---|
| Supported flush volumes | 1.28, 1.6, 3.5 and 5 gal/flush |
| American Standard tank fits | Cadet 4029, 4078, 4083, 4053 and 4650; Evolution 2 Flowise 4061; Monarch 4003; Mainstream 4061 |
| Kohler tank fits | Wellworth K-4620, K-4512 and K-4519; Portrait K-4590 |
| Additional documented fits | Aqua Source CP-321; Crane Galaxy 3742; Gerber Viper 28-590; Glacier Bay WCRS1; Sterling 404522, 402091 and 404555; TOTO Carusoe 706 |
| Material | Flexible rubber |
| Chain | Stainless steel |
| Warranty | 5 years |
| Not for | 3-inch flush valves or canister-style flush mechanisms |
Product photos
Shipping and returns
Ships from a US warehouse in 5 days. Shipping to the United States is included.
You can return an unused item within 30 days of delivery. You pay the return postage. If the item arrives damaged, or it is a different measurement than the product page states, write to support@utiliy.com and Utiliy pays the return.
Fitment answers
How do I confirm that this toilet flapper fits?
Find the tank number stamped inside the toilet tank, measure the flush-valve opening, and compare both with the fit information on this page. Brand alone does not establish fit.
Can the Korky 100BP adjust the flush volume?
Yes. Its settings cover toilets rated at 1.28, 1.6, 3.5 and 5 gallons per flush.
What comes in the package?
One Korky 100BP rubber flapper with a stainless-steel chain.
Product data and verification
Utiliy transcribes published maker or supplier specifications into consistent units and does not fill in measurements that were not supplied.
- SKU
- UTY-KORKY-100BP
- Data reviewed
- Availability
- Available after current supplier-data checks
- Machine-readable record
- Product feed
