Using only 0.8 gpf, the Viper® high efficiency toilet (HET) exceeds all WaterSense® performance requirements while saving 33% more water over standard high efficiency toilets, and a whopping 50% over the national standard 1.6 gpf toilets. Implementing the Viper’s fully glazed trapway design and 3'''' canister flush valve for virtually clog-free waste removal, the Viper® 0.8 gpf 12'''' Rough-In Two-Piece Round Front Toilet with Side Lever is offered with a side lever flush mechanism. Standard height, round front toilet easily fits into compact spaces. Gerber’s exclusive multi-point mounting system and non-corrosive, brass tank-to-bowl bolts provide ease of installation and lasting stability, making it ideal for both new installations and replacement applications. With Gerber’s industry-leading, 15-year warranty on parts and components and a limited lifetime warranty on vitreous china, you’ll get Set-It-and-Forget-it™ assurance and leave toilet troubles behind with Viper.