{"product_id":"castair-npt-female-1","title":"Castair NPT female","description":"\u003cp\u003eThe Castair PA6 is a 3\/8\" NPT female air fitting, an OEM replacement component for Cast Air compressor systems. The 3\/8\" NPT size is one of the most commonly used thread sizes on smaller Cast Air compressors and on accessory ports of larger units — gauge connections, unloader line connections, regulator inlets, and auxiliary air ports frequently use 3\/8\" NPT female threads. If a fitting is damaged or a connection point needs rebuilding, the PA6 restores it to original specification.\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 PA6 designation and NPT female specification are drawn from the product listing. Contact us to confirm the exact thread size and application before ordering.\u003c\/p\u003e\n\n\u003ch2\u003e3\/8\" NPT Female Fittings on Compressors\u003c\/h2\u003e\n\u003cp\u003eThe 3\/8\" NPT size sits between the 1\/4\" small-accessory size and the 1\/2\" main-line size in typical compressor plumbing. On Cast Air units, 3\/8\" NPT female ports commonly appear at regulator inlets, small manifold branches, check valve connections, and secondary outlet ports. The NPT taper (3\/4\" per foot) allows a pressure-tight joint when assembled with thread sealant. Always use PTFE tape or pipe thread compound on NPT joints — finger-tight alone will not hold air pressure reliably.\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 PA6\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 3\/8\" (3\/8\" NPT female)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Count:\u003c\/strong\u003e 18 TPI (standard 3\/8\" NPT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Cast Air compressor plumbing — regulator ports, gauge connections, auxiliary air outlets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Cast Air compressor systems with 3\/8\" NPT female connection points\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Applications for the PA6\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRegulator inlet ports\u003c\/strong\u003e — many Cast Air regulators use 3\/8\" NPT female inlet threads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure gauge ports\u003c\/strong\u003e — smaller gauge connections on single-cylinder and small two-cylinder units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnloader valve fittings\u003c\/strong\u003e — unloader lines on compressor heads frequently use 3\/8\" NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck valve connections\u003c\/strong\u003e — tank check valve ports on smaller Cast Air units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary outlet ports\u003c\/strong\u003e — auxiliary air outlets on multi-port manifolds\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen Does a Shop Need the PA6?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eExisting 3\/8\" NPT female fitting is cross-threaded, corroded, or cracked\u003c\/li\u003e\n\u003cli\u003eAir is leaking at a 3\/8\" NPT connection and the fitting is the source (not the sealant)\u003c\/li\u003e\n\u003cli\u003eRebuilding a Cast Air compressor assembly that required disassembly of 3\/8\" NPT connections\u003c\/li\u003e\n\u003cli\u003eAdding a regulator, gauge, or valve to a Cast Air system that has an open 3\/8\" NPT port\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 PA6\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 3\/8\" NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Count:\u003c\/strong\u003e 18 TPI (standard 3\/8\" NPT)\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 PA6 3\/8\" NPT female fitting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThread sealant is not included. Use PTFE tape or pipe thread compound rated for compressed air service on all NPT connections.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h2\u003e\n\u003cp\u003eSmall fittings make a big difference in plumbing integrity — and OEM Cast Air parts are manufactured to the thread class and material spec of the original. We have been supplying Cast Air compressor parts since 2016. If you are not sure whether PA6 is the correct size for your connection point, call us with the compressor model number and location of the fitting and we will confirm before you order. Free shipping and free tech support on every order.\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 — we confirm the right fitting before you order\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 — correct material and thread class for pressurized air service\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":53342574117077,"sku":"PA6","price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-npt-female-1","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}