Midland Black Malleable Iron Cap
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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 Cap is a standard threaded end cap for use in gas, air, and general plumbing piping systems. Used to seal the open end of a threaded pipe or fitting. Available in multiple sizes — select from the dropdown above.
Black malleable iron construction with female NPT threads. Conforms to ASTM A197 and ASME B16.3.
Applications
- Sealing open pipe ends in gas piping systems
- Capping unused branch outlets in compressed air lines
- Temporary or permanent pipe end termination
- General plumbing and mechanical piping systems
- 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
- Female NPT threads — ASME B16.3
- Seals open pipe ends — no flow through
- Multiple sizes available
Frequently Asked Questions
What does a pipe cap do?
A pipe cap threads onto the open end of a pipe or fitting to seal it — no flow passes through.
What thread type?
Female NPT threads throughout.
Are these galvanized?
No — black iron finish. For galvanized, see our galvanized fitting listings.
What standards?
ASTM A197 and ASME B16.3.
Why Contractors Choose This Product
- Seals open pipe ends in one step
- NPT threads for compatibility with standard black iron pipe
- Stocked in sizes from 1/8" through 4"
- ASTM A197 and ASME B16.3 conforming
✔ Bulk Pricing Available
✔ Fast Shipping from Multiple U.S. Warehouses
✔ Built for Contractors, Not DIY