The Multi-Function Engine Flush Mixer Unit is designed for ease of use with a new throttle type control valve to switch from off to rinse to applicator, and will handle Australian and New Zealand water pressures. The applicator holds 100ml and has been tested to withstand water pressure up to 120 psi. The Auto-Mix unit attaches easily to the muffs or engine port. Comes complete ready to use with spray nozzle.