Castair 256 Gallon Discharge Manifold — Part 256DM
The Castair 256DM is the discharge manifold for Castair compressed air systems in the 256-gallon configuration. The discharge manifold is the central connection point where compressed air from the compressor pump (or pumps, in a duplex configuration) combines before entering the receiver tank or the distribution system. It provides the porting for safety relief valves, check valves, pressure gauges, and system connections in a single assembly.
When a discharge manifold cracks, develops a leak at a port, or is damaged, the whole assembly typically needs replacement — manifold bodies are not generally field-repairable for pressure-rated connections. The 256DM is the OEM replacement for Castair systems designed around the 256-gallon configuration.
Component Details
- Part Number: 256DM
- Type: Discharge manifold
- System Compatibility: Castair 256-gallon compressor systems
- Category: Major component — tank / manifold assembly
- Manufacturer: Cast Air (Castair)
What a Discharge Manifold Does
The discharge manifold sits between the compressor pump discharge and the receiver tank (or distribution piping). It serves several functions:
- Pressure combining: On duplex units, combines the discharge from two pump heads into a single outlet stream
- Safety valve port: Provides a connection point for the pressure relief valve required by code on all compressed air systems
- Gauge port: Houses the system pressure gauge
- Check valve location: Many manifolds integrate or mount the check valve(s) that prevent backflow from the receiver to the pump at shutdown
- Service connection points: Provides porting for aftercooler connections, moisture separator connections, and system isolation valves
When a Discharge Manifold Needs Replacement
- Crack or fracture in the manifold body: A cracked manifold is a safety issue — replace it, do not attempt to repair a pressure-rated casting
- Corrosion through the manifold wall: Internal scale buildup and external corrosion can eventually perforate the manifold — replacement is the correct response
- Damaged or stripped port threads: If a port is stripped past repair, the manifold needs replacement to maintain pressure-rated connections
- System rebuild or modernization: When rebuilding a Castair system, replacing the discharge manifold ensures the central connection point is in serviceable condition
Installation Notes
Discharge manifold replacement is a major service procedure on a compressed air system:
- Depressurize and lockout/tagout the system completely before removal
- Label or photograph all connections before disassembly
- Use appropriate thread sealant on all NPT connections (do not use PTFE tape on pressure-rated connections without confirming it is rated for compressed air service)
- Test all connections after reassembly — do not return to service without a leak check at operating pressure
Technical Specifications
- Part Number: 256DM
- Manufacturer: Cast Air (Castair)
- Application: Castair 256-gallon compressor systems
- Category: Major component — discharge manifold
- Connection configuration: Contact us for port sizes and layout details
Note: Manufacturer product page data was not available at time of writing. Specifications are derived from the product name and part number. Contact us for full dimensional and connection specifications for your specific Castair system before ordering.
Why Buy From Air Compressor Factory Direct?
We have specialized in industrial air compressor equipment since 2016. A discharge manifold replacement is not a part you want to guess on — the port layout and connections must match your specific Castair system configuration. Call us with your compressor model number before ordering and we will confirm the correct manifold and walk through any installation questions.
- Free shipping on qualifying orders
- Free tech support: Call 866-217-0063 to confirm fit and discuss installation
- Full manufacturer warranty
- Honest guidance: We will confirm this is the right manifold for your system before you order
Call 866-217-0063 for quick answers and help!
