Here is how to install the water gun hose:

Connect the hose to the water gun. This step requires using a quick-connect fitting. Quick-connect fittings make the connection more convenient and fast, with good sealing performance.

Install one end of the quick-connect fitting on the hose and the other end on the water gun. When installing, ensure the fitting is securely attached to prevent leaks during use.

Generally, quick-connect fittings have a locking mechanism. When you hear a 'click' sound during installation, it indicates that the fitting is properly in place.