{"product_id":"castair-3-4-inlet-12-cfm-4-0o-d-x3-0o-a-ht-complete-air-filter-assembly-and-element-2140020a","title":"Castair 3\/4\" Inlet 12 CFM 4.0\"O.D.x3.0\"O.A.Ht. Complete Air Filter Assembly and Element 2140020A","description":"\u003ch2\u003eCastair Complete Air Filter Assembly and Element — 3\/4\" NPT Inlet, 12 CFM, Part 2140020A\u003c\/h2\u003e\n\u003cp\u003eThis is the complete intake air filter assembly for Castair air compressors equipped with a 3\/4-inch NPT inlet port. The assembly ships complete — housing and filter element — so replacement is a one-part order. At 12 CFM flow rating and a compact 4.0\" OD x 3.0\" overall height, this assembly is the correct direct-fit replacement for Castair compressor models with 3\/4\" intake connections.\u003c\/p\u003e\n\u003cp\u003eIf your compressor has a 1\/2\" NPT inlet, you want part 2140019A instead. The 3\/4\" inlet on this assembly (2140020A) is sized for slightly larger Castair pump models. Using the wrong inlet size restricts airflow or leaves a loose connection — both are problems worth avoiding.\u003c\/p\u003e\n\u003ch3\u003eAssembly Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 2140020A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Connection:\u003c\/strong\u003e 3\/4\" NPT (threaded)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow Rating:\u003c\/strong\u003e 12 CFM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 4.0\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 3.0\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContents:\u003c\/strong\u003e Complete assembly — housing and filter element\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Cast Air (Castair)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy the Inlet Filter Matters\u003c\/h3\u003e\n\u003cp\u003eThe intake air filter is the first line of defense for your compressor pump. Every cubic foot of air entering the cylinder carries ambient dust, debris, and moisture. The filter catches particulates before they reach piston rings and valve seats — components that wear fast when abrasive material gets past them.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtects piston rings and cylinder walls:\u003c\/strong\u003e Airborne particles act as abrasive between sliding surfaces inside the pump\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtects valve seats:\u003c\/strong\u003e Grit on intake valves prevents complete seating, causes blow-by, reduces efficiency, and raises operating temperature\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintains designed airflow:\u003c\/strong\u003e A clean filter at the correct CFM rating keeps the pump breathing at capacity. A clogged filter restricts intake and the pump works harder for less output\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e2140019A vs. 2140020A — Choosing the Right Filter\u003c\/h3\u003e\n\u003cp\u003eBoth assemblies share the same physical dimensions (4.0\" OD x 3.0\" height) and the same 12 CFM flow rating. The difference is the inlet connection size:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart 2140019A:\u003c\/strong\u003e 1\/2\" NPT inlet — fits smaller Castair pump models\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart 2140020A (this part):\u003c\/strong\u003e 3\/4\" NPT inlet — fits larger Castair pump models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCheck the inlet port on your compressor pump before ordering. The NPT thread size is typically stamped or cast near the port. If you cannot confirm the size, call us and we can cross-reference your compressor model.\u003c\/p\u003e\n\u003ch3\u003eWhat Is Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFilter housing (complete assembly)\u003c\/li\u003e\n\u003cli\u003eFilter element (installed, ready for use)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRegular maintenance schedule:\u003c\/strong\u003e Inspect every 3-6 months depending on shop dust levels. Replace annually in average conditions, more frequently in dusty or high-use environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhen the element is torn or collapsed:\u003c\/strong\u003e A damaged element provides no filtration — replace immediately\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhen oil-soaked:\u003c\/strong\u003e Oil on the intake filter usually means pump blow-by — address the pump issue and install a fresh filter assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAfter a pump rebuild or overhaul:\u003c\/strong\u003e Always start with a fresh filter element after any major pump service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 2140020A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Cast Air (Castair)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Port:\u003c\/strong\u003e 3\/4\" NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow Rating:\u003c\/strong\u003e 12 CFM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 4.0\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 3.0\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Complete assembly with element\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Manufacturer product page data was not available at time of writing. Specifications are derived from the product name and part number. Contact us to verify fit for your specific Castair compressor model before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe have specialized in air compressor parts and equipment since 2016. Castair replacement parts are a regular part of our inventory. If you are not sure whether 2140019A or 2140020A is the right filter for your compressor, call us — we can cross-reference your model and confirm the correct part before you order.\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 to confirm the right part for your compressor\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest guidance:\u003c\/strong\u003e We stock both filter sizes and will point you to the correct one\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":53342502191317,"sku":"2140020A","price":38.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/360_F_473254957_bxG9yf4ly7OBO5I0O5KABlN930GwaMQz_aa2bee85-41b1-46e0-a7c5-80ca1b7efcb4.jpg?v=1772652464","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-3-4-inlet-12-cfm-4-0o-d-x3-0o-a-ht-complete-air-filter-assembly-and-element-2140020a","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}