Toilet Tank, Biscuit, 1.28 Gallons per Flush

Gerber GWS3859009 Toilet Tank – 1.28 GPF, Biscuit Finish, High-Efficiency

The Gerber GWS3859009 is a high-efficiency toilet tank with a 1.28 gallon per flush (GPF) rating, engineered to meet performance and water conservation standards. Finished in biscuit, this tank is compatible with select Gerber toilet bowls and is suitable for both residential and commercial restroom installations requiring reliable flushing and consistent operation.

This two-piece gravity-fed tank is constructed from vitreous china for durability and resistance to stains. It features a left-hand trip lever and internal flushing components configured to optimize flow while reducing water consumption. The biscuit finish offers an alternative to standard white fixtures for coordinated design continuity.

Product Features

• Flush Volume: 1.28 gallons per flush (4.8 liters)
• Trip Lever Position: Left-hand
• Color: Biscuit
• Construction: Vitreous china
• Flush Type: Gravity-fed, high-efficiency system

Technical Specifications

• Model: GWS3859009
• Water Surface Area: Dependent on matching bowl configuration
• Fixture Configuration: Two-piece tank; bowl sold separately
• Compliance: Meets EPA WaterSense and applicable ANSI standards

Installation Details

Designed for use with compatible Gerber bowls, the tank installs using standard two-piece toilet mounting hardware. A tank-to-bowl gasket and fastening kit are required (typically included with bowl). Secure attachment, leak testing, and alignment should be verified during installation. Proper fill level and float adjustment should be confirmed per manufacturer specifications.

• Mounting Type: Top-mount to two-piece toilet bowl
• Tools Required: Wrench, screwdriver, level
• Installer Recommendation: Licensed plumber or qualified technician

Application Notes

This tank is part of a matched system and should be installed with compatible Gerber bowls to ensure certified performance. It is intended for use in settings where 1.28 GPF water efficiency is required by code or specification.