Pro 10 Pack —– WaterSense Listed. Neoperl 1.0 gpm, dual thread aerator (Dual threaded to fit both male and female ends). Best quality and performance at a lower cost. NSF 61 approved. Aerated soft stream produces a larger and whiter stream that is soft to the touch and non-splashing. Comes complete with instructions. ————Pressure compensating for a consistently even flow. 15/16ï¾ standard male and 55/64ï¾ standard female threads.————-The pro Pack comes in a Lifesaver pack, A perfect way to keep your aerators organized for dispensing one at a time as needed. The lifesaver pack is easy to store and use. Great for plumbers, apartments, condos, homes & commercial places. Create a great low flow faucet in your kitchen, bathroom or utility sink.