If one compressor isn’t giving you enough airflow, you might be wondering: Can I connect two air compressors together? The answer is yes—but it has to be done correctly. With the right fittings, check valves, and hoses, you can combine compressors for more capacity or higher CFM output without damaging either unit.
In this guide, we’ll explain how to connect two compressors, what tools and parts you need, and recommend the best manifolds and accessories to get the job done safely.
Quick Picks: Best Kits & Accessories for Connecting Compressors
- Best Overall: Milton Air Manifold Block Kit – Professional manifold for joining two compressors into one line.
- Best Budget: Hromee Air Hose Splitter & Check Valve Kit – Affordable option for small compressors.
- Best Premium: RapidAir 3/4″ Distribution Manifold Kit – Heavy-duty system for shops with multiple compressors.
Buyer’s Guide: How to Connect Two Compressors
There are two main ways to link compressors:
- Parallel Setup: Both compressors feed a common manifold. This increases airflow (CFM) but keeps pressure the same. Works best when both compressors have similar PSI ratings.
- Series Setup: Rarely used—one compressor feeds into another to increase pressure. Not recommended unless both units are designed for it, as it can damage tanks or pumps.
Key Things to Remember:
- Always use check valves so one compressor doesn’t push air backward into the other.
- Match PSI ratings. If one compressor cuts off at 150 PSI and the other at 125 PSI, the lower one will stop contributing earlier.
- Use a manifold block or distribution kit for a clean, reliable connection.
- Never “hard pipe” two compressors together without check valves—this can damage motors and regulators.
Detailed Product Reviews
1. Milton Air Manifold Block Kit
Who it’s for: Shops that want a reliable way to join two compressors into one system.
- Key Benefits: Heavy-duty aluminum manifold, multiple ports, universal compatibility.
- Pros: Durable, easy to configure, professional-grade.
- Cons: Requires hoses and couplers sold separately.
Final Verdict: The best all-around choice for connecting two compressors. Check Price
2. Hromee Hose Splitter & Check Valve Kit
Who it’s for: DIYers with small portable compressors who want more air without big costs.
- Key Benefits: Includes Y-splitter, hoses, and built-in check valves.
- Pros: Affordable, easy setup, prevents backflow.
- Cons: Limited durability for heavy shop use.
Final Verdict: Best budget-friendly way to link two compressors. See Price
3. RapidAir 3/4″ Distribution Manifold Kit
Who it’s for: Shops needing a permanent, heavy-duty distribution block for multiple compressors.
- Key Benefits: 3/4″ aluminum manifold, expandable system, designed for shop piping layouts.
- Pros: High flow, professional setup, expandable.
- Cons: Higher cost than simple splitters.
Final Verdict: The premium choice for multi-compressor shop setups. Check Price
4. Campbell Hausfeld Check Valve Kit
Who it’s for: Owners wanting to upgrade existing connections with reliable backflow protection.
- Key Benefits: Universal check valves, fits most tanks and hoses.
- Pros: Affordable, durable, prevents compressor damage.
- Cons: Requires correct threading to fit.
Final Verdict: A must-have for safe parallel connections. View Price
5. Milton High-Flow Couplers & Plugs
Who it’s for: Users upgrading airflow in a dual-compressor setup.
- Key Benefits: 70% more flow than standard fittings.
- Pros: Easy swap, boosts tool performance, durable steel build.
- Cons: Works best if the whole system uses high-flow fittings.
Final Verdict: An excellent airflow upgrade for combined compressors. See Price
6. Ingersoll Rand Refrigerated Dryer (15–30 CFM Models)
Who it’s for: Shops connecting two compressors that want clean, dry air.
- Key Benefits: Removes water from combined air supply, ensures consistent quality.
- Pros: Protects tools, prevents moisture issues, professional-grade.
- Cons: Adds cost and requires installation space.
Final Verdict: Essential for dual-compressor setups used in painting or precision work. Check Price
Comparison Table
| Product | Type | Key Use | Best For | Price |
|---|---|---|---|---|
| Milton Manifold Kit | Manifold Block | Joining compressors | Shops & garages | Check Price |
| Hromee Splitter Kit | Splitter + Check Valves | Budget connections | DIY users | See Price |
| RapidAir Manifold | Distribution Block | Permanent setups | Professional shops | Check Price |
| Campbell Check Valve Kit | Check Valve | Backflow prevention | Any dual setup | View Price |
| Milton High-Flow Set | Couplers & Plugs | Airflow boost | High-CFM tools | See Price |
| Ingersoll Rand Dryer | Air Dryer | Moisture control | Paint & precision work | Check Price |
Frequently Asked Questions
Can I connect two air compressors together?
Yes, you can connect compressors in parallel for more CFM. Always use check valves to prevent backflow.
Can I connect compressors in series for more pressure?
Not recommended unless both compressors are rated for it. Series setups can damage tanks and pumps.
Do both compressors need to be the same size?
No, but performance is better if they have similar PSI ratings and cut-in/cut-out settings.
What’s the safest way to connect two compressors?
Use a manifold block with check valves. This prevents one compressor from overpowering the other.
Conclusion
Connecting two air compressors is an effective way to increase airflow if you do it safely. Use a manifold block and check valves to prevent backflow and match compressors with similar PSI ratings for the best results.
The Milton Manifold Kit is the best all-around choice, the Hromee Splitter Kit works for budget setups, and the RapidAir Manifold is ideal for permanent shop installations.
Check today’s best compressor manifolds, check valves, and connection kits here