Castair 5/8" Copper Tubing (Sold by the Foot) CT58
Castair's 5/8" copper tubing sold by the linear foot sits between 1/2" discharge tube size and 3/4" large-bore mains. At $13.09 per foot, this is the correct material when larger single-stage or two-stage reciprocating compressors call for a bore between standard 1/2" and 3/4" for their discharge connections, inter-cooler tubes, or aftercooler connections. If your Castair system documentation or existing installation uses 5/8" copper, CT58 is the factory-correct replacement material.
Where 5/8" Copper Tubing Is Used
- Discharge connections on larger compressor heads: Some Castair configurations use 5/8" copper for the discharge tube run from head to tank check valve
- Inter-stage tubing on two-stage machines: The plumbing between first and second stage may require 5/8" depending on the compressor CFM and inter-cooler design
- Aftercooler inlet/outlet connections: Medium-capacity aftercooler units may call for 5/8" connection tubing
- Custom Castair compressor configurations: Castair builds custom systems; 5/8" copper is available for specifications requiring this diameter
Why Copper for Discharge Connections
- Temperature: Compressed air at compressor head discharge reaches 200-350°F. Copper handles this indefinitely; nylon, rubber, and most plastics cannot
- Pressure: Rated for compressor system pressures at 250 PSI and above with proper fittings
- Formability: Can be bent to route around obstacles without adding fittings, which reduces potential leak points
- Longevity: Properly installed copper tubing can last the life of the compressor with no replacement needed
Ordering Information
- Sold by the foot — specify footage when ordering
- Part Number: CT58
- Price: $13.09 per foot
Castair Copper Tubing Lineup
- CT25 — 1/4" copper tubing, $7.70/ft — control and pilot lines
- CT50 — 1/2" copper tubing, $10.01/ft — standard discharge tube size
- CT58 — 5/8" copper tubing, $13.09/ft (this listing) — larger discharge and inter-stage connections
- CT75 — 3/4" copper tubing, $15.40/ft — large-bore discharge and supply mains
Technical Specifications
- Part Number: CT58
- Manufacturer: Castair (Spicer, Minnesota)
- Material: Copper tubing
- Size: 5/8"
- Sold: By the linear foot
- Price: $13.09 per foot
- Application: Larger discharge tube connections, inter-stage plumbing, aftercooler connections on commercial air compressor systems
Why Buy From Air Compressor Factory Direct?
We carry the full Castair copper tubing line. If you're not sure whether 5/8" is the right diameter for your application, call us with your compressor model and we'll confirm the correct tube size.
- Free shipping on qualifying orders to the lower 48
- Free tech support — sizing help available by phone
- Full manufacturer warranty on all Castair products
Call 866-217-0063 for quick answers and help!
