The Castair Air Compressor Manifold with Safety Valve (ACM) is the standard tank manifold assembly for Cast Air compressor systems. Rated to 150 PSI, it gives you a central distribution point for compressed air lines and includes an integrated safety relief valve -- the overpressure protection that every pressurized air system is required to have. At $32.34, this is a straightforward, correctly-rated component for Cast Air installations, replacements, or new plumbing setups.
The manifold sits between your tank and your distribution lines. It gives you organized outlet ports for feed lines, provides the safety valve mount, and serves as the logical pressure control point in your system layout. If your existing manifold has a failed or missing safety valve, replace the whole manifold assembly rather than trying to retrofit a separate valve onto old threads -- this gets you a fresh, correctly-rated assembly that you know will seal properly.
Key Features
- 150 PSI rated: Matches the working pressure range of standard single-stage and two-stage shop compressors; correct for most shop air systems
- Integrated safety relief valve: Factory-installed overpressure protection -- the safety valve is included and pre-installed, not sold separately
- Cast Air OEM component: Manufactured to fit Cast Air compressor systems; listed under Controls/Gas Engines/Tank Manifolds in the Castair catalog
- Multiple outlet configuration: Provides organized distribution ports for feed lines and tool connections
- Correct plumbing geometry: Designed for the tank and plumbing layout used in Cast Air compressor systems; fits without adapter improvisation
- Minnesota-made quality: Cast Air manufactures in Minnesota with all-cast-iron construction where structural; consistent quality across the product line
Why the Safety Valve Matters
The safety relief valve on a compressor manifold is not optional equipment. If the pressure switch fails and the compressor does not shut off at the set pressure, the safety valve is the last line of protection between your tank and a rupture. Running an air system without a functional safety valve is a code violation and a genuine safety hazard.
Common reasons to replace a manifold assembly:
- Safety valve is corroded, seized, or pops at the wrong pressure and needs replacement
- Manifold has a cracked port or a fitting that will not seal regardless of thread tape
- Building a new compressor installation and starting with a complete, correct assembly
- Previous owner removed or bypassed the safety valve -- replace the whole manifold and start clean
Available Configurations and Related Controls
The ACM manifold assembly is part of the Cast Air controls and accessories line. Related components for a complete installation:
- ACM -- Air Compressor Manifold w/Safety Valve, 150 PSI, $32.34: This assembly -- the manifold and integrated safety valve
- Pressure switches: Contact us for current Cast Air pressure switch availability and compatibility by compressor model
- Gauges and regulators: Available through the Cast Air accessories catalog -- call for current inventory and pricing
If you are doing a full controls replacement on a Cast Air compressor, call us -- we can put together the correct set of components for your specific model rather than having you piece it together from individual listings.
When Does a Shop Need This vs. a Simpler Fix
Replace the full manifold assembly (ACM) when:
- The existing manifold has a cracked body or ports that cannot be sealed
- The safety valve is integrated and cannot be replaced independently without damaging the manifold
- You are doing a complete system rebuild and want fresh components throughout
- The manifold is the original unit on an older compressor and the threads are degraded
You may be able to replace just the safety valve if:
- The manifold body is sound and the valve port is a standard NPT size with clean threads
- The existing valve is clearly a standard size that can be unscrewed and replaced
If you are not sure, call us and describe what you have -- we can tell you whether the ACM is the right fix or whether a standalone valve replacement is the better call.
Technical Specifications
- Part Number: ACM
- Manufacturer: Cast Air (Castair), Minnesota
- Maximum Pressure Rating: 150 PSI
- Safety Valve: Included and pre-installed
- Safety Valve Set Pressure: 150 PSI
- Category: Controls / Gas Engines / Tank Manifolds
- Price: $32.34
- Application: Cast Air compressor systems; consult catalog for specific model compatibility
What Is Included
- One (1) ACM air compressor manifold assembly
- One (1) 150 PSI safety relief valve (pre-installed)
Why Buy From Air Compressor Factory Direct
We stock Cast Air controls and accessories alongside their full compressor and tank lineup so you can source everything from one place. Since 2016, we have supplied professional shops with the correct components for compressed air system installations and repairs. We know the Cast Air product line and can tell you whether the ACM is the right part for your situation before you order.
Free shipping on qualifying orders. Full manufacturer warranty on Cast Air parts. If you are putting together a complete controls package for a Cast Air compressor, call us -- we will help you get the right set of components without ordering parts you do not need.
Call 866-217-0063 for quick answers and help!
