Castair Complete Air Filter Assembly and Element — 1/2" NPT Inlet, 12 CFM, Part 2140019A
This is the complete intake air filter assembly for Castair air compressors with a 1/2-inch NPT inlet port. It ships as a complete unit — housing and filter element included — so you are not tracking down separate parts when you need to service the intake. The 12 CFM flow rating and compact 4.0" OD x 3.0" overall height make this a direct-fit replacement for smaller Castair compressor models running 1/2" inlet connections.
Intake filtration is not a maintenance item to skip. A clogged or missing inlet filter starves the pump, increases cylinder wear from debris ingestion, and drives up operating temperatures. Replacing this assembly on schedule — or immediately if the existing filter is torn, oil-soaked, or collapsed — is straightforward preventive maintenance that protects a much more expensive pump.
Assembly Details
- Part Number: 2140019A
- Inlet Connection: 1/2" NPT (threaded)
- Flow Rating: 12 CFM
- Outer Diameter: 4.0"
- Overall Height: 3.0"
- Contents: Complete assembly — housing and filter element
- Manufacturer: Cast Air (Castair)
Why the Inlet Filter Matters
The intake air filter is the first line of defense for your compressor pump. Every cubic foot of air that enters the cylinder carries ambient dust, debris, and moisture. The filter catches particulates before they reach the piston rings and valve seats — components that wear fast when abrasive material gets past them.
- Protects piston rings and cylinder walls: Fine airborne particles act as abrasive between sliding surfaces inside the pump
- Protects valve seats: Grit on intake valves prevents complete seating and causes blow-by, reducing efficiency and raising heat
- Maintains airflow: A clean filter at the correct CFM rating keeps the pump breathing at its designed capacity. A clogged filter restricts intake and the pump works harder for less output
- Reduces moisture carry-over: Filter media helps capture some ambient humidity before it enters the compression chamber
Inlet Size — Matching to Your Compressor
The 1/2" NPT inlet is a common port size on smaller Castair compressor pumps. Before ordering, confirm your pump's intake port size. Castair also offers a 3/4" NPT version (part 2140020A) for compressors with larger inlet ports. Do not use an undersized filter housing on a larger port — the restriction reduces airflow and reduces pump output.
- 1/2" NPT (this part, 2140019A): Fits smaller Castair pump models with 1/2" intake ports
- 3/4" NPT (part 2140020A): Fits larger Castair pump models with 3/4" intake ports
What Is Included
- Filter housing (complete assembly)
- Filter element (installed, ready for use)
When to Replace
- Regular maintenance intervals: Inspect filter element every 3-6 months depending on shop dust levels. Replace annually in average conditions, more frequently in dusty environments
- When the element is torn or damaged: A torn element is not filtering. Replace immediately
- When the element is oil-soaked: Oil on the intake filter element usually indicates a worn pump with blow-by — address the pump issue and replace the filter
- After a compressor overhaul: Always install a fresh filter when rebuilding or servicing a pump
Technical Specifications
- Part Number: 2140019A
- Manufacturer: Cast Air (Castair)
- Inlet Port: 1/2" NPT
- Flow Rating: 12 CFM
- Outer Diameter: 4.0"
- Overall Height: 3.0"
- Type: Complete assembly with element
Note: 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.
Why Buy From Air Compressor Factory Direct?
We 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 correct filter for your compressor, call us — we can look up your model and confirm the right part before you order.
- Free shipping on qualifying orders
- Free tech support: Call 866-217-0063 to confirm the right part for your compressor
- Full manufacturer warranty
- Honest guidance: We stock both filter sizes and will point you to the correct one
Call 866-217-0063 for quick answers and help!
