The STZ Industries 4 in. MIP x 2-1/2 in. FIP Black Malleable Iron Hex Bushing is engineered to deliver a reliable, compact transition between piping sizes in heavy-duty metal plumbing systems. Designed with a hex body for easy wrench access, this bushing simplifies installation and future disassembly in tight spaces.
Why this bushing stands out
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Direct-size transition: 4 in. MIP (male) to 2-1/2 in. FIP (female) connections, reducing the need for multiple adapters.
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Rugged material: Malleable iron provides lasting strength and impact resistance in demanding environments.
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Secure, durable finish: Black finish adds a layer of corrosion resistance and a clean, professional look in exposed installations.
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Lead-free construction: Built to meet concerns about lead content while maintaining performance in plumbing applications.
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Practical sizing: A single, dedicated reducer bushing for common 4" to 2-1/2" piping transitions.
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Packaged for convenience: Sold bagged for straightforward storage and handling on job sites.
Specifications at a glance
- 4
- MIP
- 2-1/2
- FIP
- Malleable iron
- Black
- 300
- 150
- Bagged
- Hex bushing
Ideal uses and scenarios
Best suited for iron-steel or threaded piping systems in commercial, industrial, and residential projects where a direct 4" male thread must connect to a 2-1/2" female thread. It’s particularly handy when retrofitting larger-diameter lines into smaller, standard piping runs or when converting legacy layouts to newer standards without swapping entire sections of pipe.
Installation tips and best practices
Before installation, ensure threads are clean and free of debris. Use an appropriate thread sealant or PTFE tape designed for metal pipes. Tighten to the recommended torque for the fitting size to achieve a reliable seal without over-tightening. If disassembly is anticipated in the future, consider a slightly looser fit during initial installation to facilitate removal.
Who benefits from this bushing
- Professional plumbers tackling commercial or residential projects involving metal piping with mixed thread sizes.
- Facility managers performing retrofits or repairs in metal distribution systems.
- Installers needing a durable, economical reducer that pairs well with standard 4" MIP and 2-1/2" FIP components.
