{"product_id":"castair-comp-fitting","title":"Castair Comp. fitting","description":"\u003ch2\u003eCastair CA12 — Genie Unloader Compression Fitting (1\/2\" x 3\/8\")\u003c\/h2\u003e\n\u003cp\u003eThe Castair CA12 is a compression fitting in Castair's Genie unloader-type check valve series — specifically a 1\/2-inch inlet by 3\/8-inch outlet compression fitting. This type of fitting is used in the unloader circuit of air compressors, where it serves as a check valve that allows air to release from the pump head when the motor shuts off (enabling the next unloaded start), while preventing reverse flow from the tank back into the pump. The CA12 uses a compression inlet fitting for direct connection to copper discharge tubing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFrom Castair's published check valve data:\u003c\/strong\u003e The CA12 is listed under \"Genie Unloader Type\" with Comp. fitting inlet, 1\/2\" x 3\/8\" inlet-outlet sizing.\u003c\/p\u003e\n\n\u003ch2\u003eWhat Genie Unloader Fittings Do\u003c\/h2\u003e\n\u003cp\u003eGenie unloader check valves serve a specific function in piston air compressors:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCheck valve function:\u003c\/strong\u003e Prevents backflow from the tank to the pump head — critical for preventing the motor from having to start against full tank pressure\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnloader function:\u003c\/strong\u003e When the motor stops (pressure switch opens), the unloader releases trapped pressure from the pump discharge side — the next motor start is fully unloaded\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompression inlet:\u003c\/strong\u003e The 1\/2-inch compression inlet mounts directly to copper discharge tubing without requiring pipe threads on the tube end\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA failed or leaking genie unloader fitting is a common cause of compressor problems — symptoms include the motor struggling to restart, cycling on the overload protector, or continuous hissing from the pressure switch unloader port after shutdown.\u003c\/p\u003e\n\n\u003ch2\u003eCastair Genie Unloader Fitting Series\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eInlet Style\u003c\/th\u003e\n\u003cth\u003eInlet-Outlet Size\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePA6\u003c\/td\u003e\n\u003ctd\u003eNPT female\u003c\/td\u003e\n\u003ctd\u003e1\/4\" x 1\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCA6\u003c\/td\u003e\n\u003ctd\u003eComp. fitting\u003c\/td\u003e\n\u003ctd\u003e3\/8\" x 1\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePA12\u003c\/td\u003e\n\u003ctd\u003eNPT female\u003c\/td\u003e\n\u003ctd\u003e3\/8\" x 3\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCA12\u003c\/td\u003e\n\u003ctd\u003eComp. fitting\u003c\/td\u003e\n\u003ctd\u003e1\/2\" x 3\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eCA = compression fitting inlet; PA = NPT female inlet. The outlet side connects to the pressure switch unloader port or tank check valve plumbing.\u003c\/p\u003e\n\n\u003ch2\u003eWhen You Need This Part\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eYour Castair compressor is struggling to restart — the motor hums and trips the overload, suggesting the pump is starting under pressure\u003c\/li\u003e\n  \u003cli\u003eYou hear continuous hissing from the area of the pressure switch after the compressor shuts off — the unloader fitting may be stuck open\u003c\/li\u003e\n  \u003cli\u003eYou're rebuilding or servicing a Castair commercial or industrial compressor and replacing all check valve and unloader components\u003c\/li\u003e\n  \u003cli\u003eYou're building a custom compressor around a Castair pump and need the unloader fitting for the pressure switch circuit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eMatch the fitting size to your discharge tube OD — the CA12 is 1\/2-inch compression inlet\u003c\/li\u003e\n  \u003cli\u003eThe 3\/8-inch outlet connects to the pressure switch unloader port — verify thread size and type on your pressure switch\u003c\/li\u003e\n  \u003cli\u003eCompression fitting installation requires a square-cut, clean tube end\u003c\/li\u003e\n  \u003cli\u003eIf the compressor has been running with a leaking unloader, inspect the pressure switch unloader port for damage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h2\u003e\n\u003cp\u003eWe stock Castair replacement parts and can help you diagnose compressor problems and identify the correct unloader fitting for your machine. Free shipping on qualifying orders. Free tech support at 866-217-0063. Full manufacturer warranty on genuine Castair parts.\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":53342530109653,"sku":"CA12","price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-comp-fitting","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}