Tap Aerators – Tap Aerators Are Of The Most Simple Water Saving Devices And They Can Be Fitted To Nearly All Taps. An aerator is a key component in the overall performance of a tap. Here is how you should expect your aerator to perform: control the water stream straightness and diameter, reduce splash by aerating the stream and eliminating side spray, save water and reduce energy costs and will help meet all the local plumbing codes and standards. Aerators come in all different flow rates 2,3.8,5 and 8 litres flow rates being some of the most common water flow rates used. Aerators are also known as tap water flow regulators. The aerator is a small attachment that either fits onto the end of the tap or can be inserted inside of the existing tap. By fitting aerators in your bathroom and kitchen taps, you will save water and save on your hot water heating costs.