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

Gerber Viper® 1.28 gpf Two-Piece Elongated Toilet – High-Performance and Water-Efficient

The Gerber Viper® GWS31512 is a two-piece elongated toilet engineered for professional-grade performance and long-term reliability. This model features a 1.28 gallons per flush (gpf) high-efficiency system, meeting EPA WaterSense® standards while delivering powerful, consistent bowl evacuation.

Designed with functionality in mind, the Viper® toilet incorporates a 3" flush valve and a dual-fed siphon jet for maximum flushing force. A tall, narrow tank profile, paired with precision front rim wash, ensures effective bowl coverage and reduced streaking. This configuration supports quick and clean bowl clearance while conserving water.

Professional-Grade Features

• High-Efficiency Flush – Operates at 1.28 gpf, reducing water usage compared to older 1.6 gpf units.
• 3" Flush Valve with Siphon Jet – Dual-fed siphon jet maximizes water force and ensures consistent performance.
• Durable Flapper System – Rigid, corrosion-resistant flapper for dependable long-term operation.
• Fluidmaster® Fill Valve – Fast, quiet tank refill with proven reliability.
• Installation-Ready Design – Tall bolt caps reduce prep work, and multipoint tank-to-bowl mounting adds stability.
• Refined Aesthetic – Compact tank design with tight-fitting lid and subtly flared bowl.
• Warranty Coverage – 15-year parts warranty and limited lifetime vitreous china warranty.

Specifications

• Flush Volume: 1.28 gpf (WaterSense® certified)
• Configuration: Two-piece elongated bowl
• Rough-In: 12 inches
• Material: Vitreous china

Installation Note

While the design facilitates efficient installation, using a licensed plumbing professional is advised to ensure full compliance with local code requirements and to optimize long-term performance.