Packaging Includes: 3/8" NPT male connector*1, 3/8" NPT female connector*1, red dust cover*2 (for male and female connector respectively). Application:Designed for high-pressure applications: hydraulic cylinders, hydraulic jacks, hydraulic pumps and cylinders, mainly used for connecting tubes, are widely used in the aerospace, automotive, electronics industries, etc.Hydraulic couplings meet all standard 7241-1 Series A coupling dimensional requirements and are interchangeable with all ISO 7241 Series A couplings, Parker 6600, Faster AN, Tomco A5600, etc. Design:Press down on the knob at the female connector, then insert the male connector and release the knob to secure it.The female end has a steel ball locking design, making the link more tight and not easy to slip; the male end has a conical spool design, which can be opened and closed automatically to avoid liquid leakage. High Material:The connector is made of carbon steel with galvanized surface, which is durable and not easy to rust.Good sealing, built-in sealing ring and card spring, effective sealing, anti-liquid leakage. Warm Tip: If you receive a defective product or have any problems about item, please feel free to contact us, we will help you as soon as possible. High Material:Carbon steel.Attention: 1. please keep them away from little kids; 2. If you receive a defective product or have any problems about item, please feel free to contact us, we will help you as soon as possible.