12" Rough-In Two-Piece Elongated ErgoHeight™ Toilet, 1.28 gpf, Bone

Gerber Viper® ErgoHeight™ 1.28 gpf Two-Piece Elongated Toilet – 12" Rough-In

The Gerber GWS3151809 Viper® toilet combines water-saving performance with user-friendly comfort. This two-piece, elongated model features an ErgoHeight™ bowl, offering a 16-3/4" floor-to-rim height that supports ADA compliance and improves accessibility. Designed with a standard 12" rough-in, it is suitable for a wide range of new installations and replacement scenarios.

Built for efficiency, the Viper® utilizes a 1.28 gallons per flush (gpf) rate and includes a 3" flush valve with a dual-fed siphon jet to deliver consistent, powerful flushing action. Its vitreous china construction and fully glazed 2" trapway provide durability and support clog-resistant operation.

Key Performance Features

• Flush Rate: 1.28 gpf high-efficiency design meets WaterSense® requirements.
• Flush System: 3" flush valve paired with dual-fed siphon jet for effective waste removal.
• ErgoHeight™ Bowl: 16-3/4" height enhances user comfort and accessibility.
• Fill Valve: Includes Fluidmaster® 400A fill valve for fast, quiet tank refilling.
• Mounting: Double nut, multi-point tank-to-bowl system increases installation stability.
• Construction: Durable vitreous china with a fully glazed 2" trapway.

Technical Specifications

• Model: GWS3151809
• Configuration: Two-piece, elongated bowl
• Rough-In: 12 inches
• Height: 16-3/4 inches to bowl rim (ErgoHeight™)
• Trapway Size: 2 inches, fully glazed
• Warranty: 15-year limited warranty on parts; limited lifetime on vitreous china

Installation Information

This model is engineered for straightforward floor-mounted installation. For proper alignment and sealing, and to meet plumbing code requirements, installation by a licensed professional is recommended. The unit comes with key internal components pre-assembled for efficiency on the job site.