Cache® aerators by Neoperl are water saving flow regulators that thread directly into faucet spouts and disappear into the faucet, making it vandal resistant by design. Cache aerators can only be removed from a unit with an aerator key. These aerators fit a majority of commercial and residential faucets by Moen, Grohe, Delta, and Kohler as well as other faucet manufacturers. There are four different sizes of Cache aerators: Standard (largest), Junior, Tiny Junior, and Tom Thumb (smallest). Standard and Junior sizes fit commercial faucets, and Tiny Junior and Tom Thumb sizes fit residential faucets. Cache aerators are available in the following flow rates, from ultra low flow to standard flow: 0.35 GPM, 0.5 GPM, 1.0 GPM. 1.2 GPM, 1.5 GPM, 1.8 GPM, and 2.2 GPM. Click Here to View Cache Aerators GPM Diagram.