Meet the STZ Industries 3 in. FIP x 3 in. FIP Galvanized Malleable Iron Coupling — a purpose-built connector that confidently joins two 3-inch female iron pipe threads. Crafted from durable malleable iron and finished with galvanized protection, this coupling is designed to stand up to real-world use in water supply, irrigation, and heavy-duty plumbing projects.
Key reasons this coupling stands out
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Two 3 in. FIP ends — precisely engineered to connect two 3" female iron pipe threads for a secure, leak-resistant join.
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Material excellence — malleable iron with a galvanized finish delivers superior strength, thread integrity, and corrosion resistance in moist environments.
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Reliable performance — rated for a maximum of 300 (pressure) and up to 150 (temperature), making it suitable for typical residential and light commercial piping needs.
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Lead-free construction — designed with safety in mind for potable water applications, aligning with modern plumbing standards.
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Practical packaging — bagged packaging protects the fitting during transit and storage, ensuring it arrives ready to install.
Where it shines in real-world use
- Connecting two sections of 3" FIP piping in water supply lines, irrigation mains, or repair work where a durable, corrosion-resistant coupling is required.
- Retrofits and renovations in commercial or residential settings where a robust, long-lasting joint is essential.
- Projects that demand a dependable, threaded connection that performs under moderate pressure and temperatures without compromising safety.
What makes this STZ coupling distinct from simpler fittings is the combination of malleable iron’s machinability with a galvanizing finish that extends service life in damp environments. The result is a dependable, straightforward solution for joining large-diameter pipes where a strong, threaded connection matters.
Installation tips for a solid, leak-free fit: ensure threads are clean, apply an appropriate thread sealant (such as PTFE tape or pipe dope), and tighten to manufacturer-recommended snugness. After installation, perform a quick pressure test to confirm a tight seal and inspect for any leaks.
Designed for professionals and serious DIYers alike, this coupling is an ideal choice when you need a sturdy, 3 in. FIP to 3 in. FIP connection that you can count on day in and day out. STZ Industries delivers a fitting that pairs practical, field-ready performance with the reliability you expect from galvanized malleable iron.
