{"product_id":"castair-3-4-copper-tubing-sold-by-the-foot","title":"Castair 3\/4\" Copper Tubing (Sold by the Foot)","description":"\u003ch2\u003eCastair 3\/4\" Copper Tubing (Sold by the Foot) CT75\u003c\/h2\u003e\n\n\u003cp\u003eCastair's 3\/4\" copper tubing is the largest in their copper tubing line, sold by the linear foot for discharge connections, large-bore compressor plumbing, and high-CFM system connections. At $15.40 per foot, this is the discharge tube material for larger two-stage and duplex reciprocating compressors and the correct copper size for Castair's 3\/4\" in-tank check valves and aftercooler connections. If your system calls for 3\/4\" copper, CT75 is the factory-correct material.\u003c\/p\u003e\n\n\u003ch3\u003eWhere 3\/4\" Copper Tubing Is Used\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarge tubes on large compressors:\u003c\/strong\u003e Two-stage commercial and industrial reciprocating compressors typically use 3\/4\" copper discharge tubes from head to tank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAftercooler connections:\u003c\/strong\u003e Castair's BGAC and FSAC aftercooler series use 3\/4\" and larger connections — 3\/4\" copper feeds these units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn-tank check valve connections:\u003c\/strong\u003e Castair's 3\/4\" compression check valves (CTD3434, CTD3410) use 3\/4\" compression tube fitting inlets — this tubing connects directly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuplex compressor installations:\u003c\/strong\u003e Plumbing connecting dual compressor units to the common manifold or tank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge-bore supply mains:\u003c\/strong\u003e Short runs of 3\/4\" main line where semi-rigid copper is preferred over threaded pipe\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Considerations\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature handling:\u003c\/strong\u003e Copper is rated for continuous use at compressor discharge temperatures (200-350°F). The discharge side of any reciprocating compressor runs hot — copper or steel only, not flexible hose or nylon\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion fittings:\u003c\/strong\u003e Castair makes 3\/4\" compression nut and sleeve (CNS34), compression adaptor (CA3434), compression elbow (CE3434), and pre-assembled 3\/4\" discharge tube with fittings (DT34)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration isolation:\u003c\/strong\u003e Always form a coil or offset bend where 3\/4\" copper connects to a vibrating compressor head — straight rigid connections fatigue at fittings over time\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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e CT75\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $15.40 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 — control, pilot, and gauge lines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCT50\u003c\/strong\u003e — 1\/2\" copper tubing, $10.01\/ft — standard discharge tube size for smaller compressors\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 (this listing) — large-bore discharge and high-CFM connections\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 CT75\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 3\/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 $15.40 per foot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Discharge tubes, aftercooler connections, large-bore compressor plumbing\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 tubing and fittings line. If you're plumbing a new system or replacing discharge tubing, we can confirm the correct tube size and help you identify the right compression fittings to pair with it. No guessing on sizes.\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 sizing questions before you order\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":53342533058773,"sku":"CT75","price":28.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/aacop_5e6d142a-c493-427e-ab33-c099f1a14e8b.png?v=1772652635","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-3-4-copper-tubing-sold-by-the-foot","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}