Galvanized NPT Plug (Square Head, Male NPT) – Class 150 Malleable Iron

Galvanized NPT Plug (Square Head, Male NPT) – Class 150 Malleable Iron Need a secure way to plug and seal off a female NPT threaded opening? Our Galvanized Malleable Iron Square Head Plugs deliver a strong, reliable closure with easy installation using a wrench on the square head. Constructed from high-quality malleable iron (ASTM A197) and hot-dip galvanized per ASTM A153, these plugs offer excellent corrosion resistance and durability. They are Class 150 rated and perfect for a wide range of uses, including: Plumbing, water lines, and irrigation systems Air, natural gas, and low-pressure steam applications Industrial piping, compressed air, and HVAC setups DIY pipe projects, railings, furniture, or structural builds Key Features: Connection Type: Male NPT (National Pipe Tapered) threads for a tight, leak-resistant seal into female fittings Head Style: Square head for easy wrench tightening and removal Pressure Rating: 150 psi saturated steam / 300 psi WOG at 150°F Finish: Hot-dip galvanized for superior rust protection in moist or outdoor environments Standards: Meets or exceeds ASME B16.14, ASME B1.20.1, and UL/FM requirements (where applicable)