Replacing accesary wrench is included. Get more flow. If you're on a well or have very low water pressure, these aerators will actually restore aeration.stuffed full be prepared for the water to rush out nearly unimpeded No more water spraying all over. Shaping the water stream coming out of the spout. Standard Size, General replacement part, Please check your aerator size before purchase! To be More Healthy. Replace the old and impeded and disgusting aerators to have clean, clear water to drink., Manufacturer: kaileyouxiangongsi