Gerber AB-21-858, 12" Rough-In Toilet Bowl, White, Elongated, 1.6 gpf, Avalanche Elite Series

Gerber Avalanche Elite® Elongated Toilet Bowl – 1.6 GPF, 12" Rough-In – Model GAB21828

The Gerber GAB21828, also known as model AB-21-858, is an elongated vitreous china toilet bowl engineered for high-performance applications requiring a 12-inch rough-in. As part of the Avalanche Elite® series, this bowl is designed for efficient waste removal, comfort, and long-term reliability in residential and light commercial settings.

Configured for use with compatible Avalanche Elite® tanks, this unit supports a full 1.6 gallons per flush (GPF) and provides extended bowl length for enhanced user comfort. Its design meets standard floor-mounted installation requirements and includes a 2" fully glazed trapway to support consistent, clog-resistant performance.

Product Features

• Bowl Shape: Elongated – provides added rim length and ergonomic comfort
• Flush Volume: 1.6 GPF – for full-flush performance in residential or multi-user environments
• Construction: Vitreous china – non-porous surface resists staining and facilitates cleaning
• Mounting Type: Floor mount – designed for 12" rough-in installations
• Trapway: 2" diameter, fully glazed for improved flow and reduced clogging

Technical Specifications

• Model: GAB21828 / AB-21-858
• Series: Avalanche Elite®
• Rough-In: 12 inches
• Flush Rate: 1.6 gallons per flush
• Color: White
• Bowl Height: Standard height (non-ADA)

Installation Considerations

This bowl is designed for installation with compatible Gerber Avalanche Elite tanks and uses standard bolt mounting. The unit should be set level and sealed properly at the floor flange to prevent leaks and ensure correct operation. For optimal results, installation should be performed by a licensed plumber familiar with local plumbing codes.

Applications

Suitable for residential renovations, new construction, and replacement jobs where a 12" rough-in and full-flush performance are required. Its elongated bowl and 1.6 GPF rating make it ideal for installations that prioritize comfort and strong waste removal performance.