The Series 6408-H-O Hollow Hex Male ORB Plugs are high-quality fittings designed to seal unused ORB (O-Ring Boss) ports in hydraulic and fluid power systems. Made from carbon steel, these plugs feature a hollow hex design, allowing for easy installation and removal using standard wrenches. The ORB threads ensure a reliable, leak-free seal by compressing the O-ring into the chamfered surface of the mating port. The hollow hex feature also enables specialized functions like venting or fluid draining, while the carbon steel construction ensures durability and strength. The Series 6408-H-O plugs are ideal for use in high-pressure environments and are essential for preventing fluid leaks, making them a key component for system maintenance and testing.