The Series 5406-SHP Male Square Head NPTF Pipe Plugs are durable, high-performance fittings designed to seal unused NPTF (National Pipe Tapered Fuel) ports in hydraulic and fluid power systems. Made from carbon steel, these male square head plugs feature NPTF threads, which provide a secure, leak-free seal by creating a metal-to-metal connection when tightened. The square head design allows for easy installation and removal with standard wrenches. Ideal for fluid and gas transfer systems, these plugs are perfect for preventing fluid leakage and contamination during maintenance or testing. The Series 5406-SHP plugs are essential for maintaining system integrity, offering reliable, long-lasting performance in high-pressure industrial applications.