The Series 5406-SHP-SS Male Square Head NPTF Pipe Plugs are robust, high-quality fittings designed to seal unused NPTF (National Pipe Tapered Fuel) ports in hydraulic and fluid power systems. Made from stainless steel, these male square head plugs feature NPTF threads that create a secure, leak-free seal through metal-to-metal contact when tightened. The square head design provides ease of installation and removal with standard wrenches. Stainless steel construction ensures exceptional resistance to corrosion, making these plugs ideal for harsh, high-pressure environments. The Series 5406-SHP-SS plugs are essential for preventing fluid leakage and contamination during system maintenance, testing, or assembly, offering long-lasting, reliable performance for fluid transfer systems.