The Castair CTJIC1234 is a copper tubing JIC adapter from the Cast Air air distribution fitting lineup. JIC (Joint Industry Council) fittings use a 37-degree flare seat to create a reliable, leak-resistant metal-to-metal connection — a step up from NPT threads alone in applications where vibration or thermal cycling could loosen a tapered thread joint over time. This adapter is intended for use in compressed air distribution lines using copper tubing, connecting tubing runs to equipment ports or branch fittings.
What JIC Fittings Are and Why They Matter
NPT (National Pipe Taper) threads are the standard for most shop air connections, but they rely on thread engagement and sealant to stop leaks. JIC fittings work differently: the tube is flared to a 37-degree cone and the fitting nose seats into that flare under torque, creating a metal-to-metal seal that does not depend on sealant. This makes JIC connections well-suited for copper tubing runs where you want a serviceable, resealable connection that can be taken apart and remade without re-tapping or replacing the port.
Key Features
- Fitting Type: JIC (37-degree flare) adapter for copper tubing
- Part Number: CTJIC1234
- Material: Copper tubing compatible adapter construction
- Application: Compressed air distribution piping systems
- Brand: Castair (Cast Air, Inc.) — Spicer, Minnesota
- Sub-category: JIC Fittings — Air Distribution Piping
Where This Fitting Is Used
The CTJIC1234 is part of Castair's air distribution piping accessories, sold alongside their compressor lineup for shops building or extending a compressed air distribution system. Typical installations include:
- Connecting copper tubing drops to tool outlets or service valves
- Joining copper tubing sections in a loop or trunk-and-branch layout
- Adapting copper tubing to NPT-threaded ports on regulators, filters, or lubricators
- Any installation where a 37-degree flare connection is preferred over a compression or NPT-threaded joint
Selecting the Right Pipe Size for Your Shop
Castair provides pipe sizing guidance for compressed air distribution based on CFM demand and total equivalent line length. As a reference:
- Up to 10 CFM, runs up to 75 ft: 1/2" pipe is sufficient
- 15-25 CFM, runs up to 100 ft: 3/4" pipe recommended
- 30-50 CFM, runs up to 200 ft: 1" pipe
- 60-100 CFM, longer runs: 1-1/4" to 1-1/2" pipe
- Over 150 CFM: 2" or larger pipe
Undersized distribution piping causes pressure drop at the tool, even when the compressor is producing adequate CFM. Size your pipe for peak demand, not average demand.
Technical Specifications
- Manufacturer: Castair (Cast Air, Inc.) — Spicer, Minnesota
- Part Number: CTJIC1234
- Fitting Standard: JIC (37-degree flare)
- Material: Copper tubing adapter
- Application: Compressed air distribution piping
- Category: Air Distribution Piping — JIC Fittings
Note: Manufacturer page was not available at time of writing. Size and pressure specifications not confirmed. Contact us at 866-217-0063 to verify specifications for your application before ordering.
Why Buy From Air Compressor Factory Direct?
We carry the full Castair fitting lineup so you can spec your distribution system and source the hardware in one order. If you are designing a new shop air system or extending an existing one, call us — we can help you select the right pipe size, fittings, and dryer/filter equipment for your CFM and pressure requirements. Free shipping on qualifying orders, free technical support at 866-217-0063, and the full manufacturer warranty.
Call 866-217-0063 for quick answers and help!
