The company policy of continued product improvement through research and development means that the information contained in this web site may change. Please ask for confirmation of technical data when ordering. At the time of going to press all information relating to pump performance is considered to be accurate resulting from extensive testing and is given in good faith. The 3" pumps were not subject to air consumption testing and the information shown is calculated. If air consumption is critical please consult Flotronic Pumps before ordering.