{"product_id":"cheemuii-brass-dot-push-lock-air-line-fittings-kit-23-piece-1-4-3-8-1-2-with-tube-cutter-ca360-brass","title":"CheeMuii Brass DOT Push‑Lock Air Line Fittings Kit 23‑Piece (1\/4\", 3\/8\", 1\/2\") with Tube Cutter, CA360 Brass","description":"\u003cstrong\u003eCheeMuii 23PCS Brass DOT Air Line Fittings Kit is a push‑to‑connect brass union set built for DOT air brake and suspension lines, including three tube sizes and a tube cutter for fast, reliable repairs.\u003c\/strong\u003e\n\n\u003cp\u003eThis kit supplies 23 pieces designed to speed up installation and maintenance of vehicle air lines. Crafted from CA360 brass and conforming to DOT FMVSS 571.106 and SAE J1131 guidance, the fittings are corrosion resistant and rated for a broad temperature and pressure range. The assortment covers 1\/4\", 3\/8\" and 1\/2\" tubing so you can match common DOT copper or compatible plastic air lines without hunting parts.\u003c\/p\u003e\n\n\u003ch3\u003eWhat exactly is included and why those sizes matter?\u003c\/h3\u003e\n\u003cp\u003eThe set contains 8 of 1\/4\" straight unions, 8 of 3\/8\" straight unions, 6 of 1\/2\" straight unions, plus a compact tube cutter. Those three diameters are the most frequently used in DOT-approved air brake and suspension systems, making the kit versatile for trucks, RVs, trailers and equipment.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e8 × 1\/4\" straight union fittings for smaller control lines\u003c\/li\u003e\n  \u003cli\u003e8 × 3\/8\" straight union fittings for mid-size airline connections\u003c\/li\u003e\n  \u003cli\u003e6 × 1\/2\" straight union fittings for main airline runs\u003c\/li\u003e\n  \u003cli\u003e1 × tube cutter to trim tubing cleanly on the job\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these push‑to‑connect fittings simplify repairs?\u003c\/h3\u003e\n\u003cp\u003eInstallation is tool‑light: insert the prepared tube into the fitting until it seats and it seals. To remove, depress the release collet and pull the tube out; this makes field swaps and troubleshooting quicker without soldering or threaded adapters.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePush‑lock design eliminates time‑consuming threading or brazing\u003c\/li\u003e\n  \u003cli\u003eRemovable fittings reduce downtime for replacements or reroutes\u003c\/li\u003e\n  \u003cli\u003eTube cutter included for clean, square cuts that ensure secure seals\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these fittings durable enough for vehicle air systems?\u003c\/h3\u003e\n\u003cp\u003eYes—the CheeMuii fittings are machined from CA360 brass for low permeability and good ductility in temperature extremes. They meet DOT and SAE-related standards commonly referenced for air brake components and hold up under typical operating ranges for road vehicles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCA360 brass construction for corrosion resistance and longevity\u003c\/li\u003e\n  \u003cli\u003eRated for vacuum up to 300 psi working pressure\u003c\/li\u003e\n  \u003cli\u003eServiceable between -40°F and +200°F (-40°C to +93°C)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich applications are these unions best suited for?\u003c\/h3\u003e\n\u003cp\u003eUse this kit wherever DOT‑style airline fittings are needed: truck and trailer brake lines, RV air suspension plumbing, workshop compressor lines using DOT copper, and on-site emergency repairs. They’re also useful for general-purpose pneumatic plumbing in industrial or lawn equipment settings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTruck and trailer air brake and suspension repairs\u003c\/li\u003e\n  \u003cli\u003eRV air systems and trailer hookups\u003c\/li\u003e\n  \u003cli\u003eWorkshop pneumatic setups and mower\/tow equipment maintenance\u003c\/li\u003e\n  \u003cli\u003eField leak repairs and temporary reroutes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The CheeMuii 23PCS Brass DOT Air Line Fittings Kit is intended for mechanics, fleet technicians, RV owners, and DIYers who service air brake or suspension systems and need a compact, standards‑minded assortment. If you work with DOT copper tubing or compatible pneumatic lines and want a ready set of push‑to‑connect unions plus a tube cutter for on‑vehicle troubleshooting or maintenance, this kit is built to keep repairs fast and repeatable without specialty tools.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these fittings compatible with DOT copper tubing?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The push‑to‑connect unions fit DOT copper tubing and similar compatible air lines sized 1\/4\", 3\/8\" and 1\/2\".\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What pressure and temperature range can the fittings handle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They operate from vacuum up to 300 psi and between -40°F and +200°F (-40°C to +93°C).\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"CheeMuii","offers":[{"title":"Default Title","offer_id":48083291275422,"sku":"B0CPLY76VN","price":64.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/cheemuii-front-packaging.jpg?v=1785830677","url":"https:\/\/northtrailauto.ca\/products\/cheemuii-brass-dot-push-lock-air-line-fittings-kit-23-piece-1-4-3-8-1-2-with-tube-cutter-ca360-brass","provider":"North Trail Auto","version":"1.0","type":"link"}