{"product_id":"brass-twist-lock-air-line-coupler-3-way-quick-connector-4-12mm","title":"Brass Twist Lock Air Line Coupler Fittings — 3-Way Push-to-Connect Quick Connector, 4–12mm Tube","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBrass Twist Lock Air Line Coupler Fittings — Reliable 3-Way Push-to-Connect for Pneumatic Systems\u003c\/h2\u003e\n\u003cp\u003eWhen a leaking or hard-to-connect air line fitting slows down your workshop or production line, every minute of downtime costs you. Whether you're a DIY enthusiast routing compressed air to multiple tools or a small shop operator building out a pneumatic circuit, you need a fitting that connects fast, holds firm, and doesn't drip. These brass twist lock air line coupler fittings are built for exactly that.\u003c\/p\u003e\n\u003cp\u003eEach fitting is a 3-way quick connector machined from solid brass, featuring a push-to-connect twist lock mechanism. Available in five tube outer diameter sizes — 4mm (≈5\/32\"), 6mm (≈1\/4\"), 8mm (≈5\/16\"), 10mm (≈3\/8\"), and 12mm (≈1\/2\") — to match standard metric pneumatic tubing. The 3-way port layout allows a single air supply to branch into two separate lines without additional adapters.\u003c\/p\u003e\n\u003cp\u003eTypical applications include workshop air distribution systems, pneumatic automation circuits, air-powered spray equipment, and DIY garage compressor setups where branching a single air line into multiple tool connections is needed. The twist lock push-to-connect design makes these fittings a go-to choice for anyone building or expanding a compressed air line system.\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:\u003c\/strong\u003e Designed for metric OD pneumatic tubing (PU, PA, PE). Select the size matching your tube's \u003cem\u003eouter diameter\u003c\/em\u003e. Not for use with imperial tubing without confirming OD match.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSpec Note:\u003c\/strong\u003e Pressure ratings and exact port dimensions vary by size. Contact us to confirm specifications before use in critical or high-cycle applications.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Brass Twist Lock Air Line Coupler 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\u003eSolid Brass Construction\u003c\/strong\u003e — Machined from brass for durability, natural corrosion resistance, and reliable performance in compressed air line systems.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTool-Free Twist Lock Connection\u003c\/strong\u003e — Push-to-connect mechanism lets you insert and lock tubing in seconds without wrenches or thread tape, reducing installation time on pneumatic quick connector setups.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔀\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e3-Way Port Layout\u003c\/strong\u003e — T-configuration allows one air supply line to branch into two circuits, eliminating the need for a separate tee adapter in your air distribution system.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e5 Metric Sizes Available\u003c\/strong\u003e — Covers 4mm, 6mm, 8mm, 10mm, and 12mm tube OD, making it straightforward to match standard metric pneumatic tubing across different circuit sizes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eReusable \u0026amp; Reconnectable\u003c\/strong\u003e — The collet-and-seal design supports repeated connect\/disconnect cycles, useful for reconfiguring air line hose fittings during shop layout changes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBroad Application Range\u003c\/strong\u003e — Suitable for workshop compressor lines, pneumatic automation, spray equipment, and DIY garage air systems where a compact 3-way quick connector is needed.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Brass 3-Way Twist Lock Air Line Fittings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003e3-Way Push-to-Connect Twist Lock Air Line Coupler Fitting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTube OD Sizes\u003c\/th\u003e\n\u003ctd\u003e4mm (≈5\/32\"), 6mm (≈1\/4\"), 8mm (≈5\/16\"), 10mm (≈3\/8\"), 12mm (≈1\/2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Ports\u003c\/th\u003e\n\u003ctd\u003e3 (T-configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConnection Type\u003c\/th\u003e\n\u003ctd\u003ePush-to-connect twist lock (tool-free)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Tubing\u003c\/th\u003e\n\u003ctd\u003eMetric OD pneumatic tubing — PU, PA (Nylon), PE\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece (1Pcs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCompressed air line systems, pneumatic circuits, workshop air distribution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\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 fitting for my air line?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the fitting size to your tube's \u003cstrong\u003eouter diameter (OD)\u003c\/strong\u003e. For example, a 6mm fitting accepts 6mm OD tubing. If you're working with imperial tubing, 1\/4\" OD is approximately 6.35mm — in most cases a 6mm fitting will work, but confirm with a caliper before ordering. When in doubt, select the size closest to your tube OD.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat pressure rating do these fittings typically handle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBrass push-to-connect fittings of this type generally handle working pressures up to approximately 150 PSI (≈10 bar) in standard pneumatic applications. Contact us to confirm the rated pressure for the specific size you need before use in high-pressure or safety-critical circuits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these fittings be used outdoors or in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBrass offers good natural corrosion resistance and is generally suitable for moderately humid or damp indoor environments. For prolonged outdoor exposure or contact with aggressive chemicals, additional sealing or a protective coating is recommended. In most cases, these fittings perform well in typical workshop or garage conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tube standards are compatible with these fittings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese fittings are designed for \u003cstrong\u003emetric OD tubing\u003c\/strong\u003e (4mm, 6mm, 8mm, 10mm, 12mm). They are compatible with standard pneumatic polyurethane (PU), nylon (PA), and polyethylene (PE) tubing of the corresponding outer diameter. Always confirm your tube's OD before ordering — inner diameter (ID) is not the relevant measurement here.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need any tools or thread tape to install these fittings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo tools are required for tube insertion. Simply push the tube in firmly until it seats and twist to lock. To release, twist and pull. No thread tape is needed for the push-in tube ports. If the fitting has a threaded body port, use PTFE tape on that thread as standard practice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the flow configuration of the 3-way connector?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 3-way design typically provides a T-shaped flow path, allowing one inlet to split into two outlets — or two lines to merge into one. This is commonly used to branch a single compressed air supply into two separate tool circuits without needing an additional tee adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these fittings reusable after disconnection?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Twist lock push-to-connect fittings are generally designed for repeated connect\/disconnect cycles. The internal collet and O-ring seal are reusable in most cases. Performance may degrade over many cycles or if the tube end is cut unevenly — always use a clean, square-cut tube end for best results.\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\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":52331462951186,"sku":"FXL397-0","price":3.25,"currency_code":"USD","in_stock":true},{"title":"6mm \/ 1Pcs","offer_id":52331462983954,"sku":"FXL397-1","price":3.52,"currency_code":"USD","in_stock":true},{"title":"8mm \/ 1Pcs","offer_id":52331463016722,"sku":"FXL397-2","price":3.74,"currency_code":"USD","in_stock":true},{"title":"10mm \/ 1Pcs","offer_id":52331463049490,"sku":"FXL397-3","price":4.15,"currency_code":"USD","in_stock":true},{"title":"12mm \/ 1Pcs","offer_id":52331463082258,"sku":"FXL397-4","price":5.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/12_1_fbd00459-6b0a-4143-8aef-4abe5f38c6b8.jpg?v=1781006912","url":"https:\/\/homediyer.com\/products\/brass-twist-lock-air-line-coupler-3-way-quick-connector-4-12mm","provider":"HomeDIYer","version":"1.0","type":"link"}