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

Gerber Viper® 1.28 GPF Round Front Two-Piece Toilet – Model GWS3150209 (Biscuit)

The Gerber Viper® GWS3150209 is a two-piece, high-efficiency toilet designed for projects requiring a 1.28 GPF flush in compact spaces. With a round front bowl and a 12-inch rough-in, this model is well-suited for smaller bathrooms without sacrificing flush performance. The unit is finished in biscuit and meets WaterSense® certification standards.

This toilet features a 3-inch flush valve and dual-fed siphon jets to ensure effective waste removal with every flush. A fully glazed 2-inch trapway supports efficient evacuation and minimizes the risk of clogging. Designed for straightforward installation, it includes a Fluidmaster® 400A fill valve and extra-tall bolt caps for added convenience on the job site.

Key Features

• Flush Rate: 1.28 gallons per flush (4.8 Lpf), WaterSense® certified
• Bowl Shape: Round front – ideal for tight clearances
• Flush Valve: 3-inch for enhanced water delivery
• Trapway: 2-inch, fully glazed for smooth operation
• Fill Valve: Fluidmaster® 400A – quiet, durable, and proven performance
• Mounting System: Double nut, multi-point tank-to-bowl connection with tool-free installation
• Color: Biscuit

Dimensions & Installation

• Rough-In: 12 inches
• Type: Two-piece toilet
• Application: Floor-mounted installation
• Additional Components: Includes corrosion-resistant flapper, bolt caps, and trip lever

Installation Guidelines

This model is designed for streamlined installation with standard plumbing tools. For code compliance and to ensure optimal sealing and performance, installation by a licensed plumber is recommended. The round front configuration provides a compact footprint for retrofits or new construction with limited space.

Warranty Information

• Vitreous China: Limited lifetime warranty
• Internal Components: 15-year limited warranty

Ideal Use Cases

• Small residential bathrooms or powder rooms
• Commercial or multi-unit housing retrofits where space is constrained
• Projects requiring WaterSense® compliance for code or rebate eligibility