VALUE PACK: 28-Pack 1/4" quick connect air fitting kit, which includes female air coupler x 2, male air coupler x 2, male air plug x 10, female air plug x 8, hex coupler x 2, hex nipple x 2, teflon tape x 2, which can almost meet your basic needs.PREMIUM MATERIAL: Our air hose fittings are made of iron with high hardness and corrosion resistance, which can extend the service life, ensuring exceptional durability and reliability even in heavy-duty applications.STANDARD DESIGN: Industrial grade M/D type, air fitting is designed with four large locking balls for fixing and locking the plug to ensure a reliable connection, the maximum pressure of the air fitting and plug is 300psi, and the essential body size is 1/4 inch.QUICK CONNECTION: Easy to install and quick disconnect, interchangeable/compatible with most manufacturers' coupler plugs, preventing air leaks and costly replacements.WIDE APPLICATION: Our 1/4 " air couplers and air plugs kit are widely applied to professional job sites, automotive shops, auto dealership service departments, homes, garages for air hoses, air compressors, air tools, air nailers, air blow guns, pressure washers, etc.