This 0.25 GPM faucet aerator by Danco has extreme water-saving features and can save you up to 89 percent water as compared to using the standard 2.2 GPM aerator. It has a removable/replaceable insert with a rainfall cascade stream and will work on most faucets. This dual threaded aerator fits either 15/16 inch-27M or 55/64 inch-27F. Get ready to save some water and money.