The ControlMax(TM) tip guard is designed to be used with all HEA(TM) guns and tips for control Max 1500 and 1700 Pro sprayers. Easily attaches to spray guns without tools. It will last 3 times longer than the traditional airless tip guards. It reduces by 55% over spraying for a more uniform finish. The diffuser measures 7/8'' (17.78 cm).