PF000549 MasterFIT Universal Bathroom Faucet Aerator - Increases spray velocity and reduces splash using only 1.5 gallon per minute. Features solid brass construction and an innovative dual-thread system that fits most faucets. Saves up to 6,500 gallons of water annually. With the Flow Rate Measure Bag Included in the Kit You can see for yourself how many gallons per minute and dollars you"re saving with your new, water and energy-efficient aerators. Features: -Aerator. -Non-splashing-1.5 gpm. -Dual thread aerator - easy to install - internally and externally threaded with 15/16 x 27 threads outside and 55/64 x 27 threads inside. -Water, energy and money saver. -Chrome plated parts meets ASTM B368 for corrosion testing. -Aerators Meet or exceed: ASME A112.18.1 / CSA B125.1; ANSI/NSF 61; California Health and Safety Code 116875 (AB 1953-2006) and Vermont Bill S.152.