Wall Hung Elongated Bowl, Back Outlet, 1.28gpf, White

21-970 Gerber Maxwell Wall-Hung Elongated Toilet Bowl – Back Outlet, 1.28 GPF

The Gerber 21-970 Maxwell Wall-Hung Elongated Toilet Bowl is engineered for professional installation in commercial and residential restroom applications requiring a back-outlet configuration. Designed for high-efficiency performance, the bowl operates at 1.28 gallons per flush (GPF) when paired with the compatible 28-970 tank. Constructed from vitreous china and featuring a dual-fed siphon jet for optimal flushing power, this unit provides durability, ADA compliance, and long-term service reliability in wall-mounted systems.

Technical Specifications

• Manufacturer: Gerber Plumbing Fixtures
• Model Number: 21-970
• Series: Maxwell
• Product Type: Wall-Hung Elongated Toilet Bowl (Back Outlet)
• Configuration: Wall-Mounted, Rear Discharge
• Flush Volume: 1.28 Gallons Per Flush (High Efficiency)
• Trapway Size: 2-inch, Fully Glazed
• Flush Valve Size: 3 inches
• Flush System: Dual-Fed Siphon Jet with Pilot Fill Valve
• Bowl Shape: Elongated
• Mounting Type: Wall-Hung with Carrier Support (by others)
• Material: Vitreous China
• Finish: White (Gloss Glaze)
• Rim Height: ADA-Compliant (17 inches nominal with seat installed)
• Outlet Type: Back Outlet, 4-inch rough-in
• Tank Compatibility: Use with Gerber Model 28-970 Tank Only
• Seat: Not Included – Standard Elongated Configuration
• Water Surface Area: 9-1/4" x 8"
• Compliance: ADA Compliant, ASME A112.19.2, CSA B45.1, EPA WaterSense Certified
• Application: Commercial and residential restrooms requiring high-efficiency, wall-hung installations

Professional Notes

The Gerber 21-970 Maxwell bowl is designed for professional plumbers installing back-outlet, wall-hung toilet systems. Proper carrier selection, alignment, and secure mounting are essential for structural and hydraulic performance. When paired with the Gerber 28-970 tank, the assembly achieves 1.28 GPF efficiency with consistent bowl wash and waste removal. Dual-fed siphon jet action provides enhanced flushing power while maintaining low water consumption. The bowl is ADA-compliant when installed at proper rim height, suitable for both retrofit and new construction.

Summary

The Gerber 21-970 Maxwell Wall-Hung Elongated Toilet Bowl features a back-outlet design, 1.28 GPF high-efficiency flush, and ADA-compliant profile. Constructed from vitreous china with a 3-inch flush valve and 2-inch fully glazed trapway, it provides reliable, high-performance operation for professional wall-mounted installations when paired with the Gerber 28-970 tank.