How to install a car wash water gun? Introduction and installation sequence of core accessories

Our common car wash water guns are mainly composed of water inlet/outlet joints, standard joints, high-end water pipes, and metal coated water guns. They are suitable for various faucets. Regardless of the flow rate and pressure of the water itself, as long as the high-pressure water gun is connected, it can increase the impact force and gently remove the dirt from the car body. So how do I connect the car wash water gun to the faucet?