The Series 5406-P External Hex Male NPTF Pipe Plugs are high-quality, durable fittings designed to seal unused NPTF (National Pipe Tapered Fuel) ports in hydraulic and fluid power systems. Made from carbon steel, these external hex male plugs feature NPTF threads, which create a secure, leak-free seal by forming a metal-to-metal connection when tightened. The external hex design allows for easy installation and removal with standard wrenches, providing convenience during maintenance or testing. These plugs are ideal for preventing fluid leaks and contamination in fluid transfer systems, ensuring system integrity and reliable performance. The Series 5406-P plugs are essential for temporarily sealing ports during system assembly, maintenance, or testing in high-pressure industrial applications.