Midland Black Malleable Iron Union
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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 Union is a three-piece threaded fitting that allows sections of pipe to be connected and disconnected without rotating the pipe. Available in multiple sizes — select from the dropdown above.
Black malleable iron construction with male NPT threads on both ends and a ground joint seal. Conforms to ASTM A197 and ASME B16.3.
Applications
- Pipe connections requiring future disassembly
- Gas piping systems with service access requirements
- Compressed air lines near equipment
- General plumbing and mechanical piping
- 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 both ends — ASME B16.3
- Three-piece design — connect and disconnect without rotating pipe
- Ground joint seat for reliable seal
- Multiple sizes available
Frequently Asked Questions
What is a union fitting?
A three-piece fitting that joins two pipe ends and allows disconnection without rotating either pipe — used where disassembly is needed.
What thread type?
Male NPT threads on both ends.
Are these galvanized?
No — black iron finish.
What standards?
ASTM A197 and ASME B16.3.
Why Contractors Choose This Product
- Allows pipe disassembly without rotating pipe
- Ground joint seal for leak-free connection
- Three-piece construction for easy field assembly
- Stocked in 1/4" through 3"
✔ Bulk Pricing Available
✔ Fast Shipping from Multiple U.S. Warehouses
✔ Built for Contractors, Not DIY