"Service Port". Size 5 Pin"

The 5/16″ Copper Access Valve is a heavy-duty service port designed for larger domestic systems and modern high-pressure inverter air conditioners. As many newer R410A and R32 units utilize 5/16″ service ports or tubing, this valve provides a critical, leak-proof access point for charging refrigerant, monitoring system health, and performing essential maintenance. Each valve features a high-purity copper stem for reliable brazing and a forged brass head to withstand frequent manifold connections.