{"product_id":"castair-1-2-compression-nut-sleeve-cns12","title":"Castair 1\/2\" Compression Nut \u0026 Sleeve CNS12","description":"\u003ch2\u003eCastair CNS12 — 1\/2\" Compression Nut and Sleeve\u003c\/h2\u003e\n\n\u003cp\u003eThe CNS12 is a 1\/2-inch compression nut and sleeve set from Castair, used in the discharge tube connections on air compressor installations. This is the hardware that makes a compression fitting seal — the nut threads onto the fitting body and the sleeve (ferrule) compresses against the tubing OD to create a leak-free connection without soldering or flaring.\u003c\/p\u003e\n\n\u003cp\u003eCastair sells the CNS12 as a replacement or additional set for installations using Castair discharge tubes (DT12 — 1\/2-inch discharge tube with fittings) or anywhere a 1\/2-inch compression fitting is needed on the discharge side of a piston compressor. If you are building a new installation or replacing damaged compression hardware, this is the correct part for 1\/2-inch copper or suitable tubing at the compressor discharge connection.\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, when tightened, forces the sleeve to compress against the tubing OD, creating a seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression Sleeve (Ferrule):\u003c\/strong\u003e Deforms slightly as the nut is tightened, conforming to the tubing OD and the fitting seat for a leak-free joint. Replace any damaged, cracked, or over-compressed ferrule — a compromised ferrule will leak.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/2\" Tube OD:\u003c\/strong\u003e Fits 1\/2-inch OD tubing — verify your tubing outside diameter before ordering. Compression fittings size to tubing OD, not to pipe thread nominal size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement Hardware:\u003c\/strong\u003e Order CNS12 when the original nut and sleeve are damaged, cross-threaded, or missing. Do not reuse a ferrule that has already been compressed onto tubing in a previous installation — the deformed ferrule will not seal properly on new tubing.\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 between the compressor pump head and the check valve or receiver inlet on Castair and compatible piston compressors.\u003c\/li\u003e\n\u003cli\u003eAny compression fitting installation on the discharge side of the air system using 1\/2-inch OD tubing.\u003c\/li\u003e\n\u003cli\u003ePairs with the Castair DT12 (1\/2-inch discharge tube with fittings) for complete discharge tube assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Castair Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNS34:\u003c\/strong\u003e 3\/4\" compression nut and sleeve — same design for larger 3\/4-inch tubing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDT12:\u003c\/strong\u003e 1\/2\" discharge tube with fittings — complete assembly that uses CNS12 hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDT34:\u003c\/strong\u003e 3\/4\" discharge tube with fittings — uses CNS34 hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCA1212:\u003c\/strong\u003e Compression adaptor 1\/2\" x 1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCE1212:\u003c\/strong\u003e Compression elbow 1\/2\" x 1\/2\"\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 CNS12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTubing Size:\u003c\/strong\u003e 1\/2\" 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 and carry their full accessories and replacement parts lineup. If you are unsure whether the CNS12 is the right part for your installation, call 866-217-0063 and we will confirm it. 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":53342532436181,"sku":"CNS12","price":12.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/CompressionNut_ec97fb2e-5957-40e1-b902-6d5f9db5bca0.jpg?v=1772652624","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-1-2-compression-nut-sleeve-cns12","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}