{"product_id":"brass-compression-union-straight-coupling-fitting","title":"Brass Compression Union Straight Coupling – 4–16mm \u0026 Imperial","description":"\n\u003ch2\u003eBrass Compression Union Straight Coupling — Multi-Size Adapter Fitting\u003c\/h2\u003e\n\u003cp\u003eAchieve a secure, leak-free connection every time with this heavy-duty \u003cstrong\u003eBrass Compression Union Straight Coupling\u003c\/strong\u003e. Available in a wide range of metric and imperial sizes — 4, 5, 6, 8, 10, 12, and 16 mm as well as 1\/8\", 3\/16\", 1\/4\", 5\/16\", 3\/8\", and 1\/2\" — this versatile adapter is the go-to solution for instrumentation, hydraulic, and pneumatic systems.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eMade in Mainland China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHex grip on both sides:\u003c\/strong\u003e The hex-head design on both ends ensures excellent grip for easy installation and removal using standard wrenches.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal compatibility:\u003c\/strong\u003e Works seamlessly with copper, brass, aluminum, and plastic tubing — ideal for converting between different tube sizes and materials.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeavy-duty brass construction:\u003c\/strong\u003e Rust-proof, corrosion-resistant, and built to handle high temperatures with low magnetic permeability for lasting performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDeep, precision threads:\u003c\/strong\u003e High-quality deep threads allow the fitting to bite firmly, delivering a perfect compression seal for a dependable leak-free connection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThree-piece design:\u003c\/strong\u003e Consists of a nut, sleeve, and body with an attached insert — the standard compression fitting configuration for a reliable, robust seal.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide size range:\u003c\/strong\u003e Metric (4–16 mm) and imperial (1\/8\"–1\/2\") options available to suit virtually any plumbing or fluid-system project.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax pressure rating:\u003c\/strong\u003e Suitable for systems up to 850 kPa.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eBrass (Copper alloy)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eConnection Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eCompression Union \/ Straight Coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eAvailable Sizes (Metric)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e4, 5, 6, 8, 10, 12, 16 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eAvailable Sizes (Imperial)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e1\/8\", 3\/16\", 1\/4\", 5\/16\", 3\/8\", 1\/2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eGold (Brass)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eMax Pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u0026lt; 850 kPa\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eTypical Applications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eInstrumentation, hydraulic systems, pneumatic systems\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e1 × Brass Compression Union Straight Coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;border:1px solid #ddd;\"\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-400cm-sealing-tape-faucet-sealing-tape-oil-free-leak-proof-water-pipe-gas-pipeline-sealing-tape\"\u003e1PC 400cm Sealing Tape – Leak-Proof Water Pipe \u0026amp; Gas Pipeline Tape\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-multi-use-faucet-bubbler-wrenches-6-sizes-sink-wrenches-detach-tool-for-kitchen-bathroom-faucet-parts-repair-spanner\"\u003e1PC Multi-Use Faucet Bubbler Wrenches – 6 Sizes Sink Detach Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-10g-high-grade-silicon-grease-lubricant-o-lubrication-good-odorless-smoothness-for-o-rings-tube-silicone-grease-lubricant\"\u003e1PC High Grade Silicone Grease Lubricant for O-Rings \u0026amp; Tubes\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What types of tubing are compatible with this brass compression coupling?\u003c\/h4\u003e\n\u003cp\u003eA: This brass compression union straight coupling is compatible with copper, brass, aluminum, and plastic tubing. Its three-piece construction (nut, sleeve, and body with insert) provides a firm, leak-free grip on all these tube materials, making it highly versatile for plumbing, instrumentation, and fluid-system projects.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What sizes are available for this compression fitting?\u003c\/h4\u003e\n\u003cp\u003eA: The fitting is available in both metric sizes — 4, 5, 6, 8, 10, 12, and 16 mm — and imperial sizes — 1\/8\", 3\/16\", 1\/4\", 5\/16\", 3\/8\", and 1\/2\". This broad size range ensures compatibility with most standard tubing used in hydraulic, pneumatic, and instrumentation systems.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the maximum pressure this compression coupling can handle?\u003c\/h4\u003e\n\u003cp\u003eA: This brass compression straight coupling is rated for system pressures below 850 kPa. It is well-suited for typical instrumentation, pneumatic, and low-to-medium-pressure hydraulic applications. Always verify your system's pressure requirements before installation.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is any special tool required to install this fitting?\u003c\/h4\u003e\n\u003cp\u003eA: No special tools are needed. The hex-head design on both sides of the coupling provides excellent grip for a standard wrench, making installation and removal straightforward for both professionals and DIY users.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What types of tubing are compatible with this brass compression coupling?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This brass compression union straight coupling is compatible with copper, brass, aluminum, and plastic tubing. Its three-piece construction (nut, sleeve, and body with insert) provides a firm, leak-free grip on all these tube materials, making it highly versatile for plumbing, instrumentation, and fluid-system projects.\"}}, {\"@type\": \"Question\", \"name\": \"What sizes are available for this compression fitting?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The fitting is available in both metric sizes — 4, 5, 6, 8, 10, 12, and 16 mm — and imperial sizes — 1\/8\\\", 3\/16\\\", 1\/4\\\", 5\/16\\\", 3\/8\\\", and 1\/2\\\". This broad size range ensures compatibility with most standard tubing used in hydraulic, pneumatic, and instrumentation systems.\"}}, {\"@type\": \"Question\", \"name\": \"What is the maximum pressure this compression coupling can handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This brass compression straight coupling is rated for system pressures below 850 kPa. 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