Description Give us a call with any questions you have about your toilet problems, our experts are here to make your toilet flush stronger.  Gerber Maxwell Dual Flush Toilets Two-Piece Model – Tank # DF-28-995 Flush valve fits 3 inch, 2 piece flush holes for Gerber Maxwell Top Button Dual flush. The Dual button canister flush valve is designed to perform half power and full power flushes to save water  The fill valve features an anti-siphon design and has an adjustable 7-14″ height  The kit includes the rubber grommet and nylon bolts needed for installation Easy to install Great for fixing noisy running toilets