Item Type: Air Hose Fittings Material: Aluminum Alloy Connector Size (Male or Female): 3/8 Inch NPT Connection Type: Quick Connect Application: Air Hose Quick Connect Fittings Package List 4 x Air Hose Fitting 16 Locking Balls: There are six locking balls in this air hose connector to securely hold the air hose plug safely and reliably. 2Excellent Aluminum Alloy Material: This air hose connector is made of excellent aluminum alloy material, which is sturdy and durable, not easy to be damaged, and has a long service life. 3Thickened Plating: This air hose connector features a thickened plating for high erosion resistance and long service life. 43/8 NPT Thread: This air hose fitting features a 3/8 NPT thread, which makes installation very easy, you just need to align the threads to screw the vessel onto the corresponding device. 5Good Performance: This air hose fitting has good performance and is resistant to high pressure and high temperature, with a maximum working pressure of 300 PSI and temperatures up to 250 F.