FOAMJET TM 12E - Digital direct injection foam proportioning system is used to maintain selected constant foam-water proportion regardless of water flow fluctuations . The system accurately delivers foam concentrate from 0.1 % to 8 % through a check valve / injector fitting , directly into the water discharge stream . The system uses high quality industrial components . Digital direct injection foam proportioner uses electrically driven foam pump . The pump and motor drive are designed for long-term load with over temperature and over current protection . For top performance the maintenance free brushless motor is used . Fast selection with rotary encoder knob is suitable for easy percentage setting .