Meet the Smith-Cooper 1/8 in. FPT X 1/8 in. D Stainless Steel Union — a compact, corrosion-resistant connector designed to join two small-diameter lines with a clean, leak-tight seal. Crafted from durable stainless steel and built to be lead-free, this union delivers reliable performance in water, air, and light industrial applications where space is at a premium.
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Two 1/8" connections: one end features a 1/8" Female Pipe Thread (FPT), while the opposite end provides a 1/8" diameter connection for a tight, space-saving join.
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Alloy that lasts: stainless steel construction resists rust, corrosion, and harsh environments, making it ideal for outdoor irrigation, workshop lines, and equipment feeds.
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Precision and reliability: manufactured for accurate threading and a compact profile, so you can install in confined spaces without compromising seal integrity.
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Removable, maintenance-friendly: the union design allows quick assembly and disassembly, enabling easy maintenance, reconfiguration, or repairs without soldering or permanent fittings.
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Lead-free safety: formulated to meet modern safety standards, suitable for potable water and standard fluid systems where code compliance matters.
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Protected during storage: bagged packaging helps prevent contamination and ensures clean, ready-to-use threads upon arrival.
How this fitting solves real-world problems
In tight installations where space and material compatibility are critical, this Smith-Cooper union provides a robust connection without bulk. Whether you’re routing small-diameter water lines, supplying pneumatic circuits, or linking instrumentation ports, the 1/8 in. FPT X 1/8 in. D union keeps your system flowing smoothly and reconfigurable for future needs.
Who benefits most
- Professional plumbers, HVAC technicians, and irrigation specialists who value corrosion resistance and dependable seals in compact fittings.
- Engineers and technicians assembling small-diameter networks in laboratories, workshops, or field sites.
- DIYers working on projects where a removable, metal-to-metal seal is preferred over soldered joints.
Installation and care tips
- Prepare mating surfaces by cleanly removing debris and ensuring threads are undamaged before assembly.
- Use a compatible thread sealant or PTFE tape rated for your fluid type and system pressure, applying sparingly to prevent contamination.
- Tighten gradually with appropriate tools to achieve a snug seal without over-tightening, then check for leaks after pressurizing the system.
- Periodically inspect the union in service, especially in environments with vibrational loads or thermal cycling.
