EEnhance your toilet’s performance with the power of EcoFlush. Our patented technology harnesses supply line water pressure and stores it in an engineered pressure vessel. Once the handle is tripped, high-pressure water-flow is discharged into the toilet bowl to create an ultra-efficient and high-powered flush. In addition to its performance, EcoFlush also helps you make a sustainable impact on the environment by reducing your toilet's water use. This system can only be used with specific pressure assisted toilets made by American Standard, Crane Plumbing, Foremost, Gerber, Mansfield, and Zurn that currently or previously used a model B8100 or B8106. In addition, this unit can be dropped into toilets containing or compatible with Sloan Flushmate models: M-101526-F3HGK M-101526-F3HMK M-101526-F3HCK. Compatible replacement for/with the following systems: American Standard Crane Plumbing Foremost Gerber Mansfield Zurn Sloan Flushmate. Left Hand Unit. If You Have A Right Hand Unit You Need To Order B8106-06R Flush Control Valve.