{"product_id":"stainless-steel-compression-coupling-fittings-4-16mm","title":"Stainless Steel Compression Coupling Fittings for Pipe — 4mm to 16mm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eStainless Steel Compression Coupling Fittings — Reliable Pipe Connections from 4mm to 16mm\u003c\/h2\u003e\n\u003cp\u003eLeaking pipe joints are one of the most frustrating problems a homeowner or plumber faces — water damage, wasted time, and repeat repairs. Whether you're fixing a drip under the sink, extending an irrigation line, or connecting tubing in a tight mechanical space, you need a fitting that seals right the first time and stays sealed. These stainless steel compression coupling fittings are built for exactly that job, giving DIYers, contractors, and maintenance professionals a dependable, tool-friendly solution.\u003c\/p\u003e\n\u003cp\u003eEach set contains one compression coupling fitting per piece ordered, constructed from corrosion-resistant stainless steel. The coupling body, compression nut, and ferrule ring work together to create a leak-free mechanical seal without soldering or adhesives. Available in seven sizes — 4mm (≈5\/32\"), 6mm (≈15\/64\"), 8mm (≈5\/16\"), 10mm (≈25\/64\"), 12mm (≈15\/32\"), 14mm (≈35\/64\"), and 16mm (≈5\/8\") — to match a wide range of pipe outer diameters. Order in quantities of 1, 2, 5, 10, 20, or 50 pieces depending on your project scope.\u003c\/p\u003e\n\u003cp\u003eThese compression couplings are well-suited for residential plumbing repairs, drip irrigation system assembly, pneumatic tubing connections in workshops, and light industrial fluid-line maintenance. Long-tail use cases include replacing damaged copper pipe sections, joining polyethylene tubing for garden irrigation, and connecting stainless steel capillary lines in appliance installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e Select the size that matches your pipe's \u003cem\u003eouter diameter (OD)\u003c\/em\u003e. These fittings are generally compatible with copper, soft copper, nylon, and polyethylene (PE) tubing of matching OD. Not recommended for rigid PVC without a liner insert. Contact us to confirm fit for specialty tubing.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Stainless Steel Compression Coupling Fittings\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFerrule Compression Seal\u003c\/strong\u003e — The two-piece ferrule-and-nut design creates a tight mechanical seal on the pipe OD without soldering, making it a go-to choice for no-solder pipe repair in tight spaces.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStainless Steel Construction\u003c\/strong\u003e — Resists rust, oxidation, and mild chemical exposure, so these fittings hold up in outdoor irrigation lines, humid crawl spaces, and corrosive environments where standard brass fittings may fail.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSeven Size Options (4–16mm OD)\u003c\/strong\u003e — Covers the most common small-bore pipe and tubing diameters used in residential plumbing, drip irrigation, and pneumatic tubing systems, reducing the need to source multiple fitting types.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTool-Friendly Installation\u003c\/strong\u003e — Requires only two adjustable wrenches to install — no torch, no crimper, no special equipment. Ideal for DIY plumbing repairs and field maintenance where specialized tools aren't available.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Available in 1, 2, 5, 10, 20, and 50-piece packs, so you can grab a single fitting for a quick fix or stock up for a full irrigation system installation at a lower per-unit cost.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStraight Coupling Design\u003c\/strong\u003e — The inline coupling body joins two pipe ends of the same diameter in a straight run, making it the correct choice for extending or repairing a continuous pipe line without changing direction.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Stainless Steel Compression Coupling Fittings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eFitting Type\u003c\/th\u003e\n\u003ctd\u003eCompression Coupling (straight, two-end)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Sizes (Pipe OD)\u003c\/th\u003e\n\u003ctd\u003e4mm (≈5\/32\"), 6mm (≈15\/64\"), 8mm (≈5\/16\"), 10mm (≈25\/64\"), 12mm (≈15\/32\"), 14mm (≈35\/64\"), 16mm (≈5\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConnection Method\u003c\/th\u003e\n\u003ctd\u003eCompression (ferrule + nut, no soldering required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pipe Types\u003c\/th\u003e\n\u003ctd\u003eCopper, soft copper, nylon, polyethylene (PE) tubing — matching OD required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWorking Pressure\u003c\/th\u003e\n\u003ctd\u003eSee variant options — contact us to confirm for your application\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBrushed stainless steel (natural)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity Options\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 5 \/ 10 \/ 20 \/ 50 pcs per order\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInstallation Tools Required\u003c\/th\u003e\n\u003ctd\u003eTwo adjustable wrenches (no torch or crimper needed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eBefore ordering:\u003c\/strong\u003e Always measure your pipe's \u003cem\u003eouter diameter\u003c\/em\u003e with calipers — pipe nominal size and actual OD often differ. If you're unsure which size fits your tubing, contact us before purchasing.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right size compression coupling fitting?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the fitting size to your pipe's \u003cstrong\u003eouter diameter (OD)\u003c\/strong\u003e — not the nominal pipe size. For example, a 4mm fitting suits tubing with a 4mm OD (approximately 5\/32\"). Use calipers to measure your pipe OD before ordering. Available sizes range from 4mm (≈5\/32\") to 16mm (≈5\/8\"). When in doubt, size up and verify — a fitting that's too small won't seat properly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat pressure can these compression fittings handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStainless steel compression fittings generally handle working pressures up to 150–300 PSI, though the actual rating depends on the pipe size, wall thickness, and the tubing material being used. For critical or high-pressure applications, contact us to confirm the rating for your specific size and use case before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these fittings outdoors or in wet\/corrosive environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Stainless steel provides strong resistance to rust, oxidation, and mild chemical exposure, making these compression couplings well-suited for outdoor irrigation systems, exposed plumbing runs, humid crawl spaces, and coastal environments where standard carbon steel or brass fittings may corrode over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat pipe types are compatible with these compression couplings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese fittings are typically compatible with \u003cstrong\u003ecopper, soft copper, nylon, and polyethylene (PE) tubing\u003c\/strong\u003e of matching outer diameter. They are not generally recommended for rigid PVC or CPVC pipe without a liner insert, as rigid plastic may not compress evenly under the ferrule. Contact us if you're working with specialty tubing materials.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need special tools to install a compression coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIn most cases, only \u003cstrong\u003etwo adjustable wrenches\u003c\/strong\u003e are needed — one to hold the fitting body steady and one to tighten the compression nut. No soldering torch, crimping tool, or pipe threading equipment is required. This makes compression couplings one of the most DIY-friendly pipe connection methods available for small-bore tubing repairs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many fittings do I need per pipe joint?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eOne compression coupling connects two pipe ends, so you need \u003cstrong\u003e1 piece per joint\u003c\/strong\u003e. If you're repairing a section of pipe, you'll typically need 2 couplings (one at each cut end) plus a replacement pipe segment. Order in bulk (5, 10, 20, or 50 pcs) if you have multiple joints to connect — bulk packs offer a lower per-unit cost.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these fittings use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are \u003cstrong\u003ecompression-style fittings\u003c\/strong\u003e that use a ferrule-and-nut mechanism rather than a threaded pipe connection, so no NPT or BSP thread standard applies to the pipe end itself. The compression nut is typically metric-threaded to match the fitting body. If you need to connect to a threaded port or adapter, contact us to confirm compatibility before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003esize and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"4mm \/ 1pcs","offer_id":52336724771090,"sku":"WZYGLBZSJ017925x1","price":2.9,"currency_code":"USD","in_stock":true},{"title":"6mm \/ 1pcs","offer_id":52336724803858,"sku":"WZYGLBZSJ017926x1","price":3.03,"currency_code":"USD","in_stock":true},{"title":"8mm \/ 1pcs","offer_id":52336724836626,"sku":"WZYGLBZSJ017927x1","price":3.06,"currency_code":"USD","in_stock":true},{"title":"10mm \/ 1pcs","offer_id":52336724869394,"sku":"WZYGLBZSJ017928x1","price":3.33,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 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