The Castair DTF50J11.25-SS is a copper discharge tube fitting — a pre-formed 1/2-inch copper tube section measuring 11.25 inches in length, used at the pump discharge connection on Castair air compressors. These fittings are the precision-bent copper tube segments that connect the pump's discharge port to the tank check valve or downstream plumbing, navigating the specific geometry of compressor mounting configurations. The straight-to-straight compression end configuration on this unit handles a specific routing requirement in the compressor assembly.
What These Fittings Are For
Air compressor pump discharge connections require copper or steel rigid tubing — not rubber hose — because pump discharge air temperatures regularly exceed 250–300°F immediately after compression. The discharge tube fitting is the curved or straight copper section that bridges between the pump outlet port and the rest of the discharge plumbing (check valve, tank, or flex connection to the distribution system).
Castair offers multiple discharge tube fittings in the DTF50J series to cover different compressor configurations. The lengths (11.25", 19.5", 25", 30", 36") reflect the different standoff distances required in various compressor frame sizes and tank configurations. When you need to replace a discharge fitting, matching the exact length and end configuration is critical — an incorrect length won't reach the ports correctly, and incorrect end fitting geometry won't seal.
Specifications
- Part number: DTF50J11.25-SS
- Material: Copper
- Tube diameter: 1/2" (50 in the part number designation)
- Length: 11.25 inches
- End type: straight-to-straight compression
- Application: Pump discharge connection on Castair compressors
Note: Specific compressor model compatibility for each length variant is not published in Castair's public catalog. Contact us with your compressor pump model and frame configuration to confirm which DTF50J length you need before ordering.
Why Copper for Discharge Tube Fittings?
- Heat tolerance: Copper handles continuous 300°F+ air temperatures without degradation. At pump discharge, the air is at its hottest point in the system — copper is the appropriate material for this application.
- Workability: Copper can be field-bent to minor adjustments if needed, though these pre-formed fittings should fit the intended application without modification.
- Compression fitting compatibility: Copper tube works with standard compression fittings and sleeves — no special tools required for installation.
- Vibration resistance: Properly supported copper discharge tubing handles compressor vibration better than rigid black pipe, which is why Castair uses it at the pump-to-tank connection point.
Companion Parts
- DT12: 1/2" discharge tube with fittings (pre-assembled tube assembly)
- DT34: 3/4" discharge tube with fittings (for larger pump outlets)
- CA1212: Compression adaptor 1/2"x1/2"
- CE1212: Compression elbow 1/2"x1/2"
- CNS12: Compression nut and sleeve, 1/2"
- CT50: 1/2" copper tubing by the foot — if you need a custom-length run
When to Replace a Discharge Tube Fitting
- Visible corrosion, pinhole leaks, or cracking at any point in the tube body
- Leaks at either compression end that can't be corrected by tightening
- During a pump rebuild — replace discharge fittings at the same time as pump valves and rings
- If the original fitting shows heat discoloration or has been previously over-tightened
Why Buy From Air Compressor Factory Direct?
- Specialist since 2016 — we stock Castair discharge tube fittings and can help identify the correct length for your compressor
- Free shipping on qualifying orders
- Free tech support at 866-217-0063 — call us with your pump model and we'll confirm which DTF50J length you need
- Full manufacturer warranty on Castair parts
- Honest guidance — if you need a different length or the DT12 pre-assembled tube instead, we'll advise you correctly
Call 866-217-0063 for quick answers and help!
