Designed by Hersill, Perflow is a click style flowmeter made for use on hospital pipelines. The flowmeter is able to be utilized on all types of pipeline pressures and always gives an accurate flow regardless of what inlet pressure is coming from the installation. It has 14 precalibrated flows and incorporates a pressure reducer inside. The Perflow body is constructed from aluminum, the dial is polycarbonate and the DISS outlet is made from chromium-plated brass. Other components of the flowmeter are made from silicone, stainless steel, polyamide and NBR. Several models of Perflow are available for newborns, children and adults.