{"product_id":"castair-1-4-copper-tubing-sold-by-the-foot-ct25","title":"Castair 1\/4\" Copper Tubing (Sold by the Foot) CT25","description":"\u003ch2\u003eCastair 1\/4\" Copper Tubing (Sold by the Foot) CT25\u003c\/h2\u003e\n\n\u003cp\u003eCastair's 1\/4\" copper tubing sold by the linear foot is the correct material for small-bore connections on commercial air compressor systems — pilot lines, gauge connections, unloader lines, and control tubing. At $7.70 per foot, order the exact footage you need for your installation. Copper is specified over nylon for any connection near compressor heads or discharge points where temperatures exceed what plastic tubing can handle.\u003c\/p\u003e\n\n\u003ch3\u003eWhere 1\/4\" Copper Tubing Is Used on Compressor Systems\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot valve lines:\u003c\/strong\u003e The small-bore connections between pressure switches, pilot valves, and unloader systems typically run 1\/4\" copper or nylon tubing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGauge lines:\u003c\/strong\u003e Connecting pressure gauges to the tank or discharge line\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnloader connections:\u003c\/strong\u003e Running the unloader signal line from the check valve unloader port to the pressure switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl tubing:\u003c\/strong\u003e Any control or signal line in the 1\/4\" size range where copper is specified over nylon for heat resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-volume instrument air:\u003c\/strong\u003e Small service drops for instrumentation or specialty tools\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Copper vs. Nylon for These Connections\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature resistance:\u003c\/strong\u003e Copper handles the heat near compressor heads and discharge points. Nylon softens at elevated temperatures and is not suitable for hot-side connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure handling:\u003c\/strong\u003e Properly connected copper tubing handles compressor system pressures at 250 PSI and above\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil compatibility:\u003c\/strong\u003e Fully compatible with compressor oil and oil mist in the air stream\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration routing:\u003c\/strong\u003e Copper can be bent to form isolation loops at vibrating components, preventing fatigue failures at fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCastair also carries NT25\u003c\/strong\u003e — 1\/4\" nylon tubing for applications where flexibility is the priority and heat is not a concern\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by the foot\u003c\/strong\u003e — specify footage when ordering. Add 10-15% extra for bends and cuts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e CT25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $7.70 per foot\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCastair Copper Tubing Lineup\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCT25\u003c\/strong\u003e — 1\/4\" copper tubing, $7.70\/ft (this listing) — control and pilot lines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCT50\u003c\/strong\u003e — 1\/2\" copper tubing, $10.01\/ft — standard discharge tube size\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCT58\u003c\/strong\u003e — 5\/8\" copper tubing, $13.09\/ft — larger discharge and inter-stage connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCT75\u003c\/strong\u003e — 3\/4\" copper tubing, $15.40\/ft — large-bore discharge and supply mains\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAt connections to vibrating components, form a short coil or offset bend in the tubing to act as a vibration isolator\u003c\/li\u003e\n\u003cli\u003eUse compression fittings or flare fittings rated for the pressure in your system — don't use low-pressure plumbing fittings on compressor lines\u003c\/li\u003e\n\u003cli\u003eCastair's systems operate to 250 PSI and above; ensure your fittings carry appropriate pressure ratings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e CT25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Castair (Spicer, Minnesota)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Copper tubing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold:\u003c\/strong\u003e By the linear foot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $7.70 per foot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Control lines, pilot lines, gauge connections, instrument connections on air compressor systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe stock the full Castair copper tubing line. Order the exact footage you need. We can advise on whether copper or nylon tubing is right for your specific connection and which fittings work with each tubing size.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders to the lower 48\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree tech support\u003c\/strong\u003e — call with tubing selection or fitting compatibility questions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e on all Castair products\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342532796629,"sku":"CT25","price":14.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/aacop_ccbecb46-e64f-48ef-8185-07e947210076.png?v=1772652630","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-1-4-copper-tubing-sold-by-the-foot-ct25","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}