Foam Cannon uses a thicker and heavier brass core for durable use and is leak-free when to use it. The bottle is made of PA plastic, very thick and durable, not easy to crack. Adjustable jet nozzle for accurate mixing and foam generation, adjust the nozzle to get a proper jet pattern (wide to narrow), adjust the knob on the top to control how much water is mixed in and the thickness of the foam jet. With 1/4" quick connect fitting for easy operation. Adjustable spray nozzle to choose suitable spray pattern. Water regulator knob to control water and foam. Foam spray Guns mix high-pressure water flow with detergents and air to produce thick bonding foams. Very suitable for car, motorcycle cleaning, floor, window cleaning, driveway, roof, side cleaning, etc. The nozzle can be adjusted to select the appropriate spray pattern. The water adjustment knob is used to control water and foam.