{"product_id":"castair-npt-female","title":"Castair NPT female","description":"\u003cp\u003eThe Castair PA12 is a 1\/2\" NPT female air fitting, a standard plumbing component used on Cast Air compressor systems for connecting air lines, gauges, valves, and other threaded accessories at 1\/2\" NPT connections. If an NPT fitting on your Cast Air compressor is damaged, cross-threaded, or corroded, this is the OEM-spec replacement to restore the connection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote: Cast Air did not provide a dedicated manufacturer product page for this fitting.\u003c\/strong\u003e The PA12 designation and NPT female specification are taken from the product listing. Contact us to confirm exact application and thread count before ordering if you have any doubt about fitment.\u003c\/p\u003e\n\n\u003ch2\u003eNPT Female Fittings on Air Compressors — What You Need to Know\u003c\/h2\u003e\n\u003cp\u003eNPT (National Pipe Taper) is the standard thread form for air compressor plumbing in the United States. The taper — 3\/4\" per foot — allows the threads to wedge together and form a pressure-tight seal without a separate gasket, though thread sealant (PTFE tape or pipe thread compound) is required for reliable sealing at compressor pressures. A female NPT fitting accepts a male threaded connection; the \"12\" in PA12 indicates 1\/2\" nominal pipe size, which is one of the most common sizes on mid-range Cast Air compressor heads, manifolds, and outlet ports.\u003c\/p\u003e\n\n\u003ch3\u003eFitting Specification Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e PA12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e NPT (National Pipe Taper)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Gender:\u003c\/strong\u003e Female\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Size:\u003c\/strong\u003e 1\/2\" (1\/2\" NPT female)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Air compressor plumbing — head outlets, manifolds, gauge ports, drain connections\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Cast Air compressor systems with 1\/2\" NPT female connection points\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications on Cast Air Compressors\u003c\/h2\u003e\n\u003cp\u003e1\/2\" NPT female fittings appear in multiple locations on Cast Air compressor systems:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutlet port connections\u003c\/strong\u003e — the main air outlet from the compressor head or tank to the shop air system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure gauge ports\u003c\/strong\u003e — tank and line gauge connections on higher-pressure models\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety valve connections\u003c\/strong\u003e — pressure relief valves are frequently 1\/2\" NPT on Cast Air units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManifold connections\u003c\/strong\u003e — multi-outlet manifolds use NPT female ports at each branch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrain valve connections\u003c\/strong\u003e — tank drain valve port on some Cast Air tank configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen Does a Shop Need This Fitting?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eExisting 1\/2\" NPT female fitting is damaged, cross-threaded, or corroded past sealing reliably\u003c\/li\u003e\n\u003cli\u003eRebuilding or reassembling a Cast Air compressor after a repair that required removing plumbing\u003c\/li\u003e\n\u003cli\u003eAdding a new accessory connection point to an existing Cast Air compressor manifold\u003c\/li\u003e\n\u003cli\u003eReplacing a fitting that was originally installed with incorrect thread sealant and is now weeping air\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNPT vs. NPSM vs. NPTF — Why Thread Form Matters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNPT (this fitting):\u003c\/strong\u003e Tapered thread. Standard for most air compressor plumbing. Requires thread sealant for a pressure-tight joint.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNPSM:\u003c\/strong\u003e Straight mechanical thread, used for unions and couplings that rely on a separate seal. Not interchangeable with NPT in pressure applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNPTF (Dryseal):\u003c\/strong\u003e Similar taper to NPT but with closer thread tolerances allowing a dry (sealant-free) pressure-tight joint. Compatible with NPT but requires precise thread engagement.\u003c\/li\u003e\n\u003cli\u003eFor Cast Air compressor plumbing, NPT with PTFE thread sealant is the correct approach. Always confirm the mating fitting is also NPT before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e PA12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Cast Air (Castair)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard:\u003c\/strong\u003e NPT (National Pipe Taper)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Gender:\u003c\/strong\u003e Female\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Size:\u003c\/strong\u003e 1\/2\" NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Count:\u003c\/strong\u003e 14 TPI (standard 1\/2\" NPT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Not specified — confirm with us before ordering for high-pressure or high-temperature applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Data:\u003c\/strong\u003e Product page not available — specifications from product listing data\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat Is Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Castair PA12 1\/2\" NPT female fitting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThread sealant (PTFE tape or pipe thread compound) is not included and is required for installation. Do not install NPT fittings dry on pressurized air systems.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h2\u003e\n\u003cp\u003eWe stock Cast Air original parts — not generic plumbing fittings that may not match the material, thread class, or pressure rating of the original. Since 2016, we have been the specialist source for Cast Air compressor parts. Free shipping, free tech support, and full manufacturer warranty on every part we sell.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCast Air specialist\u003c\/strong\u003e since 2016\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on all orders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree tech support\u003c\/strong\u003e — confirm part compatibility before ordering\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM parts\u003c\/strong\u003e — not generic plumbing substitutes\u003c\/li\u003e\n\u003c\/ul\u003e\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":53342574051541,"sku":"PA12","price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-npt-female","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}