12" Rough-In Two-Piece Elongated Toilet, 1.28 gpf, Biscuit

Gerber Viper® 1.28 GPF Elongated Two-Piece Toilet – Model GWS3151209

The Gerber Viper® GWS3151209 is a 1.28 gallons per flush (GPF) two-piece elongated toilet engineered for 12" rough-in installations. Designed to meet WaterSense® certification standards, this model delivers efficient performance with consistent bowl evacuation. Featuring a compact tank profile and proven internal components, it is well-suited for residential upgrades or light commercial projects requiring dependable flushing power.

Flush Performance and Design Advantages

• Flush Mechanism: 3" flush valve paired with dual-fed siphon jets to maximize velocity and bowl coverage.
• Water Use: Rated at 1.28 GPF (4.8 LPF), helping meet efficiency mandates while maintaining effective solid waste removal.
• Trapway: Fully glazed 2" trapway minimizes obstruction risk and enhances flow-through performance.
• Tank Configuration: Vertical tank design with high wall clearance ideal for space-conscious installations.
• Componentry: Includes Fluidmaster® 400A fill valve and brass tank-to-bowl hardware for long-term reliability.

Specifications

• Model: GWS3151209
• Bowl Shape: Elongated
• Toilet Type: Two-piece
• Flush Rate: 1.28 gallons per flush
• Rough-In: 12 inches
• Compliance: EPA WaterSense® certified

Installation Considerations

The Viper® GWS3151209 incorporates an extra-tall bolt cap system to eliminate the need for on-site bolt trimming. The multi-point tank-to-bowl mounting improves joint integrity during installation. While installation is straightforward for experienced professionals, adherence to local code and proper sealing procedures is recommended for best results.

Contractor Notes

• Applications: Ideal for replacement or new construction where a 12" rough-in is standard.
• Maintenance: Compatible with common replacement parts, simplifying serviceability.
• Performance Assurance: Designed to reduce callbacks by delivering consistent bowl rinse and reducing clog potential.