Niagara's revolutionary Tri-Max Aerator offers three adjustable spray options for optimal task performance and maximum water savings. Simply twist the aerator to produce a 0.5 GPM flow rate for soaping, an eco friendly 1.0 GPM, or the 1.5 GPM power rinse mode. These aerators accommodate both male and female applications and install by hand without tools. Niagara's faucet aerators save money on water and energy by producing forceful streams at a reduced flow rate that minimizes the amount of energy needed to heat hot water.