Set it and forget it with the reliable Viper 1.28 GPF (4.8 Lpf) Toilet. The tall, narrow designed Viper tank optimizes flush speed and quickly refills using a trusted, industry best, Fluidmaster. 400A Fill Valve. Powerful front rim jets maintain a clean and sanitary bowl with every flush. An exclusive multi-point mounting system and non-corrosive brass tank-to-bowl bolts ensure long-lasting stability and ease of installation, making Viper the professional's choice.