Skip to content
Gerber Tank Model 28-990 Guide
The Gerber tank model number 28-990 has two different variants, a 1.28GPF and 1.6GPF, or Gallons Per Flush.
You can most commonly find the gallons per flush where the tank meets the bowl behind the toilet seat.
Select the gallon per flush your tank model 28-990 uses below
- Choosing a selection results in a full page refresh.
- Opens in a new window.