{"product_id":"castair-1-4-nylon-tubing-sold-by-the-foot-nt25","title":"Castair 1\/4\" Nylon Tubing (Sold by the Foot) NT25","description":"\u003ch2\u003eCast Air NT25 — 1\/4\" Nylon Tubing for Air Compressor Control Circuits\u003c\/h2\u003e\n\n\u003cp\u003eThis is 1\/4\" nylon tubing, sold by the foot, designed for use in pneumatic control circuits on air compressors. If you are replacing or extending the tubing that runs between your pressure switch, pilot valve, unloader valve, or any other control-circuit component, this is the material you need. It is flexible enough to route through tight spaces, rated for the pressures and temperatures found in compressor control lines, and compatible with standard 1\/4\" compression fittings and push-to-connect fittings used throughout the industry.\u003c\/p\u003e\n\n\u003cp\u003eNylon tubing is the standard choice for signal lines and sensing lines on reciprocating compressors. It is not used for main air discharge lines — that is what copper tubing is for. But for the low-flow, low-volume lines that carry pilot signals from your pressure switch to your unloader, or from your regulator to a downstream control, nylon is the correct material: lightweight, flexible, easy to cut and route, and resistant to kinking when installed with reasonable bend radii.\u003c\/p\u003e\n\n\u003ch3\u003eWhat This Tubing Is Used For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure switch sensing lines:\u003c\/strong\u003e The small-bore line that carries tank pressure to the pressure switch diaphragm. When this line cracks or hardens, the switch reads incorrectly or fails to cycle.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePilot valve signal lines:\u003c\/strong\u003e On two-stage compressors with pneumatic unloaders, a pilot signal line carries regulated pressure to the unloader pilot valve. This is one of the most common lines to replace during a service call.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnloader lines:\u003c\/strong\u003e The line between the pilot valve and the unloader valve itself. Subject to cycling pressure every time the compressor starts and stops.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRegulator outlet lines:\u003c\/strong\u003e When a secondary regulator feeds a downstream tool or manifold, 1\/4\" nylon tubing is a clean, flexible connection method.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAny low-flow control circuit:\u003c\/strong\u003e Anywhere on the compressor where you need to carry a pressure signal, not a main airflow stream.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMaterial Properties\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Nylon (polyamide)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside diameter:\u003c\/strong\u003e 1\/4\" — fits standard 1\/4\" OD compression and push-to-connect fittings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexibility:\u003c\/strong\u003e Flexible and easy to route; holds shape without kinking when bent with reasonable radius\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature rating:\u003c\/strong\u003e Suitable for the temperature ranges found in compressor control circuit environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e Appropriate for compressor control line pressures (signal lines, not main discharge)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Natural nylon (semi-transparent or white)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCut-to-length:\u003c\/strong\u003e Sold by the foot; specify feet required when ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNylon Tubing vs. Copper Tubing — Which Do You Need?\u003c\/h3\u003e\n\u003cp\u003eCast Air offers both nylon and copper tubing. Here is a straightforward guide:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUse nylon (NT25) for:\u003c\/strong\u003e Control signal lines, sensing lines, pilot lines, unloader signal lines — anywhere flexibility is more important than heat resistance, and where the line does not carry high-volume discharge air\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUse 1\/4\" copper (CT25) for:\u003c\/strong\u003e Discharge lines or control circuits where a more rigid, heat-tolerant line is needed — copper handles heat from compressed air better in high-cycle applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUse 1\/2\" copper (CT50) for:\u003c\/strong\u003e Larger discharge or inter-stage lines on two-stage compressors\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUse 5\/8\" copper (CT58) for:\u003c\/strong\u003e Larger compressor discharge connections\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUse 3\/4\" copper (CT75) for:\u003c\/strong\u003e High-volume main lines where copper is specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you are replacing a line and are not sure whether the original was nylon or copper, look at the existing installation. Nylon lines are typically flexible and routed with gradual bends. Copper lines are rigid and will have visible bends formed with a tubing bender.\u003c\/p\u003e\n\n\u003ch3\u003eOrdering Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSold by the foot:\u003c\/strong\u003e Specify the number of feet required when placing your order\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $3.85 per foot\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum order:\u003c\/strong\u003e Contact us for minimum quantity if ordering a single foot\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFittings:\u003c\/strong\u003e Not included — order the appropriate 1\/4\" compression or push-to-connect fittings separately if needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Replacement Scenarios\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompressor short-cycling:\u003c\/strong\u003e A cracked or blocked sensing line can cause the pressure switch to read erratic pressures, resulting in short-cycling or failure to cut out. Replacing the sensing line is often the first step in diagnosing this symptom.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnloader not releasing on restart:\u003c\/strong\u003e A damaged pilot signal line can prevent the unloader from getting the signal it needs to open on startup. A new section of nylon tubing costs less than four dollars per foot and is the correct place to start diagnosis.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eScheduled preventive maintenance:\u003c\/strong\u003e On compressors that run high cycle counts, replacing nylon control lines every few years is inexpensive insurance against unexpected failures during peak demand.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem modification or extension:\u003c\/strong\u003e If you are adding a secondary pressure switch, installing an additional regulator station, or reconfiguring a control panel, NT25 tubing lets you route new signal lines cleanly and professionally.\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 NT25\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e 1\/4\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Nylon\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSold:\u003c\/strong\u003e By the foot\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $3.85 per foot\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Pneumatic control circuits — signal lines, sensing lines, unloader lines, pilot valve lines\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible fittings:\u003c\/strong\u003e Standard 1\/4\" OD compression fittings and push-to-connect fittings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe have been supplying air compressor parts and replacement components since 2016. We stock Cast Air OEM parts because they are the correct specification for the machines they came off of. When you order NT25 tubing here, you are getting the same material Cast Air uses at the factory — not a generic substitute that might differ in wall thickness or pressure rating.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFree tech support:\u003c\/strong\u003e Call 866-217-0063 and talk to someone who knows compressors\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e on all parts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHonest guidance:\u003c\/strong\u003e If you are not sure whether you need nylon or copper tubing, or how much to order, call us and we will help you figure it out before you place the order — not after\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":53342572773589,"sku":"NT25","price":7.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/NylonTubing.jpg?v=1772652754","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-1-4-nylon-tubing-sold-by-the-foot-nt25","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}