HHO Unit P Box 766 - Interchangeable. Increase power and expect to save from 10 to 40% fuel on HWY. Application designed for 4, 6 and 8 cylinders diesel or gasoline vehicles (RVs, Trucks, and Boats & Cars). Work max 30 amps. It is a "plug and play" unit. Inside the box you will find: HHO dry cell; bubbler; water pump; fan; water tank; fuse breaker; electronic solenoid; PWM integrated. The system comes ready to install. It comes with a 25ft hose; quick fitting connectors; 25ft wires and electrical connectors. This unit is designed to feed the HHO before the throttle body.