This set includes a pressure gauge, an air filter with a pressure regulator, and adapters for G1/8 and G1/4 plugs. The pressure gauge allows you to monitor and measure the air pressure accurately. This is useful for ensuring that the pressure remains within the desired range for your specific application. The air filter with a pressure regulator helps to maintain clean and filtered air by removing impurities and contaminants from the compressed air. It also features a pressure regulator that allows you to adjust the air pressure to your desired level. This is particularly useful when different tools or equipment require different air pressure settings. Additionally, the set includes adapters for G1/8 and G1/4 plugs. These adapters enable you to connect the set to various types of mini air compressors, ensuring compatibility and versatility. Overall, this set provides a convenient and comprehensive solution for managing air pressure and maintaining clean air supply when using mini air compressors.