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)