WaterSense Listed. Neoperl 1.0 gpm aerator. Dual thread. Best quality and performance at a lower cost. NSF 61 approved. Multiple laminar stream produces a miniature shower pattern to provide full coverage of the hands while washing. (Mini Shower Spray Pattern) Pressure compensating for an even and consistent flow with plenty of force. Easy to install, no tools necessary. 15/16" standard male and 55/64" standard female threads.