Comes with international quick fit hose connectors to connect mixer to hose and motor flushers/engine TO FLUSH ENGINE put 40-60 mls (min 1/2 – 3/4 cup) Salt-Away concentrate in mixer cup for up to 90 hp motor, and for 90-300 hp use 80 mls (full cup) to flush your engine, wash boat, trailer, fishing and diving gear. Follow engine flush instructions included with kit. It handles extreme water pressure up to 120 PSI. It mixes up to 512 parts water to one part concentrate! That’s 480 litres! The Salt Attack spray gun also works great with Marine Washcoat and Shine!