{"product_id":"castair-3-4-compression-nut-sleeve-cns34","title":"Castair 3\/4\" Compression Nut \u0026 Sleeve CNS34","description":"\u003ch2\u003eCastair CNS34 — 3\/4\" Compression Nut and Sleeve\u003c\/h2\u003e\n\n\u003cp\u003eThe CNS34 is a 3\/4-inch compression nut and sleeve set from Castair, used in discharge tube connections on larger air compressor installations. The compression nut threads onto the fitting body; the sleeve (ferrule) compresses against the tubing OD as the nut is tightened, creating a sealed joint without soldering or flaring.\u003c\/p\u003e\n\n\u003cp\u003eThe CNS34 is the larger counterpart to the CNS12, matching the 3\/4-inch discharge tube used on higher-output compressors. Use it to replace damaged or missing compression hardware on existing 3\/4-inch discharge tube assemblies, or when building new connections using Castair DT34 discharge tubing or compatible 3\/4-inch OD copper or appropriate tubing.\u003c\/p\u003e\n\n\u003ch3\u003eWhat This Part Does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression Nut:\u003c\/strong\u003e Threads onto the male fitting body and drives the sleeve to compress against the tubing OD when tightened, forming a pressure-tight seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression Sleeve (Ferrule):\u003c\/strong\u003e Deforms to conform to the tubing OD and fitting seat. Always use a new, undamaged ferrule — a previously compressed ferrule will not seal correctly when installed on new or different tubing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\/4\" Tube OD:\u003c\/strong\u003e Fits 3\/4-inch outside diameter tubing. Compression fitting sizes refer to tubing OD — confirm your tubing is 3\/4-inch OD before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement Part:\u003c\/strong\u003e Order CNS34 when original hardware is damaged, cross-threaded, or missing on an existing 3\/4-inch discharge tube assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhere This Part Is Used\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDischarge tube connections on larger piston air compressors using 3\/4-inch OD discharge tubing.\u003c\/li\u003e\n\u003cli\u003ePairs with the Castair DT34 (3\/4-inch discharge tube with fittings) for complete discharge tube assemblies.\u003c\/li\u003e\n\u003cli\u003eAny compression fitting connection in the compressor discharge circuit using 3\/4-inch OD tubing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Castair Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNS12:\u003c\/strong\u003e 1\/2\" compression nut and sleeve — for smaller discharge tube connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDT34:\u003c\/strong\u003e 3\/4\" discharge tube with fittings — complete assembly that uses CNS34 hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDT12:\u003c\/strong\u003e 1\/2\" discharge tube with fittings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCA3434:\u003c\/strong\u003e Compression adaptor 3\/4\" x 3\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCE3434:\u003c\/strong\u003e Compression elbow 3\/4\" x 3\/4\"\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 CNS34\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTubing Size:\u003c\/strong\u003e 3\/4\" OD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContents:\u003c\/strong\u003e Compression nut and compression sleeve (ferrule)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Compressor discharge tube and compression fitting connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Castair, Spicer, Minnesota\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe have sold Castair parts and components since 2016. If you need to confirm the right compression hardware for your discharge tube size, call 866-217-0063 and we will sort it out. Free shipping on qualifying orders, full manufacturer warranty, free technical support.\u003c\/p\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":53342532534485,"sku":"CNS34","price":14.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/CompressionNut.jpg?v=1772652626","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-3-4-compression-nut-sleeve-cns34","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}