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Midland Industries

Midland Black Malleable Iron Plug

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✔ Contractor-Grade Black Malleable Iron – Threaded NPT
✔ Bulk Pricing Available – Multiple Sizes In Stock

High Demand Item – Frequently Reordered by Plumbing and Gas Contractors

The Midland Black Malleable Iron Plug is a threaded male plug used to seal female-threaded openings in gas, air, and plumbing piping systems. Available in multiple sizes — select from the dropdown above.

Black malleable iron construction with male NPT threads. Square or hex head for wrench tightening. Conforms to ASTM A197 and ASME B16.3.

Applications

  • Sealing female-threaded outlets in gas piping
  • Plugging unused ports in compressed air systems
  • General plumbing and mechanical piping
  • Temporary or permanent port sealing
IMPORTANT:
  • For low-pressure applications only — not rated for high-pressure service
  • Black iron finish — not suitable for outdoor or corrosive environments without additional protection
  • Always verify local code compliance before installation

Key Features

  • Black malleable iron — ASTM A197
  • Male NPT threads — ASME B16.3
  • Square/hex head — wrench tightening
  • Multiple sizes available

Frequently Asked Questions

What does a pipe plug do?

Threads into a female-threaded opening to seal it — no flow passes through.

What thread type?

Male NPT threads.

Are these galvanized?

No — black iron finish.

What standards?

ASTM A197 and ASME B16.3.

Why Contractors Choose This Product

  • Seals female ports in one step
  • Male NPT for standard fitting compatibility
  • Wrench-tightenable head
  • Stocked in sizes from 1/8" through 4"
✔ In Stock – Ready to Ship
✔ Bulk Pricing Available
✔ Fast Shipping from Multiple U.S. Warehouses
✔ Built for Contractors, Not DIY