Meet the STZ Industries 1/4 in. FIP x 1/8 in. FIP Black Malleable Iron Reducing Coupling — a durable, lead-free solution engineered for reliable small-bore plumbing connections. Designed with two female iron pipe threads, this reducer lets you step down from a 1/4" line to a precise 1/8" branch without swapping entire runs.
Why this reducing coupling stands out:
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Dual FIP ends for seamless adaptation — each end features standard female iron pipe threads (FIP), enabling straightforward connections to compatible male pipes and fittings.
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Malleable iron with a protective black finish — built to resist everyday wear, providing dependable performance in typical residential and light commercial applications.
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Lead-free construction — a safety-driven choice for potable water systems and other low-pressure fluid lines.
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Solid pressure and temperature tolerance — rated for up to 300 psi and 150°F, making it suitable for cold and warm water installations, irrigation lines, and simple distribution runs.
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Practical, space-saving design — the compact reducing coupling minimizes the number of parts needed when routing small-diameter branches, helping you maintain clean, efficient layouts.
Ideal use cases
- Retrofits and repairs where a 1/4" line must feed a 1/8" branch without overhauling the entire piping run.
- Residential potable water projects, low-pressure systems, and irrigation setups that require reliable, code-compliant connections.
- Enclosures or tight spaces where larger fittings would be cumbersome—this compact reducer fits where only a small reduction can solve the plumbing challenge.
How to use
- Ensure both mating threads are clean and free of debris.
- Apply PTFE thread sealant (or pipe joint compound compatible with water service) to the male threads.
- Thread the coupling onto the male pipe ends hand-tight, then snug with a wrench. Do not overtighten, as this can damage threads.
- Check for leaks after pressurizing the system and re-tighten if necessary.
Product details at a glance
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End 1 diameter: 1/4 in. (FIP)
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End 2 diameter: 1/8 in. (FIP)
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End 1 type: FIP
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End 2 type: FIP
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Material: Malleable iron
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Finish: Black
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Maximum pressure: 300 psi
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Maximum temperature: 150°F
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Packaging: Bagged
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Lead content: Lead-free
With its focused reduction from 1/4" to 1/8" and sturdy malleable iron construction, this STZ reducing coupling delivers reliability where it counts—quietly supporting your plumbing project, from quick repairs to precise new installs. Ready to simplify your next piping job? Add this black malleable iron reducer to your toolkit and tackle small-diameter transitions with confidence.
