If you own an air compressor, you already know how important it is to drain condensation from the tank. Moisture builds up every time you run your compressor, and if it’s not removed, it can cause rust, reduce tank life, and even contaminate your air tools. Manually draining the tank works, but it’s easy to forget. That’s why many shops and homeowners install an auto drain—a small device that automatically removes water on a set schedule or whenever pressure drops.
In this guide, we’ll cover the best automatic drains for air compressors, how to choose the right one, and which models deliver the best performance for different setups.
Quick Picks: Best Auto Drains
- Best Overall: Ingersoll Rand Electronic Automatic Drain Valve – Reliable, programmable, and works on most compressors.
- Best Budget: Mann Filter Timer Auto Drain – Affordable electronic drain with adjustable timer.
- Best Premium: Wilkerson Pneumatic Auto Drain – High-end, maintenance-free option with no electricity required.
Buyer’s Guide: Choosing the Right Auto Drain
Before you buy an auto drain, it’s important to know the different types and what fits your compressor best. Here are the key factors to consider:
- Type of Drain: Timer-controlled drains release water at intervals, while float drains release only when water reaches a certain level.
- Power Source: Some drains require electricity (110V/220V), while pneumatic options work without wiring.
- Connection Size: Most drains use 1/4″ or 3/8″ NPT fittings—make sure it matches your tank.
- Durability: Brass and stainless steel internals last longer than plastic valves.
- Ease of Maintenance: Some drains require regular cleaning, while others are virtually maintenance-free.
Detailed Product Reviews
1. Ingersoll Rand Electronic Automatic Drain Valve
Who it’s for: Shops and homeowners wanting a reliable, programmable solution.
- Key Benefits: Adjustable timer and interval, compact design, easy install.
- Pros: Trusted brand, dependable performance, customizable drain cycles.
- Cons: Requires electricity.
Final Verdict: The best all-round choice for most compressors. Check Price
2. Mann Filter Electronic Timer Auto Drain
Who it’s for: Budget-conscious users needing a simple timed drain.
- Key Benefits: Adjustable on/off intervals, fits most compressors, low cost.
- Pros: Affordable, effective, easy to set up.
- Cons: Build quality is lighter than premium models.
Final Verdict: Best entry-level option. See Price
3. Wilkerson Pneumatic Auto Drain Valve
Who it’s for: Industrial users who prefer a maintenance-free solution without wiring.
- Key Benefits: Pneumatic operation, no electricity required, high flow capacity.
- Pros: Maintenance-free, rugged design, great for large compressors.
- Cons: More expensive than timer drains.
Final Verdict: Premium choice for long-term durability. Check Price
4. Solberg Drainmaster Automatic Drain
Who it’s for: Medium-sized shops needing a reliable electronic drain.
- Key Benefits: Programmable timer, corrosion-resistant body, easy servicing.
- Pros: High-quality build, long service life, compact size.
- Cons: Requires electrical connection.
Final Verdict: A solid mid-range drain for daily shop use. View Price
5. Speedaire Electric Auto Drain Valve
Who it’s for: Buyers needing a compact, reliable, electric auto drain.
- Key Benefits: Small form factor, easy installation, timer adjustment.
- Pros: Affordable, simple to use, dependable performance.
- Cons: Not as rugged as industrial-grade models.
Final Verdict: Great for smaller compressors. Check Price
6. Parker Automatic Float Drain Valve
Who it’s for: Users wanting a set-and-forget solution that drains only when water collects.
- Key Benefits: No timer required, automatic float action, simple operation.
- Pros: No electricity needed, simple design, low maintenance.
- Cons: Less control than electronic timers.
Final Verdict: Excellent for those who prefer passive operation. See Price
Comparison Table
| Model | Type | Power | Best For | Price |
|---|---|---|---|---|
| Ingersoll Rand Auto Drain | Timer Electronic | 110V | Shops & garages | Check Price |
| Mann Filter Timer Drain | Timer Electronic | 110V | Budget users | See Price |
| Wilkerson Pneumatic | Pneumatic | Air-powered | Industrial users | Check Price |
| Solberg Drainmaster | Electronic Timer | 110V | Medium shops | View Price |
| Speedaire Auto Drain | Electronic | 110V | Small compressors | Check Price |
| Parker Float Drain | Float | None | Hands-off operation | See Price |
Frequently Asked Questions
Do I really need an auto drain for my compressor?
Yes. Moisture buildup can damage your compressor tank and shorten its lifespan. Auto drains remove water automatically, saving you the hassle of manual draining.
What’s better: a timer drain or a float drain?
Timer drains give you control over intervals, while float drains only activate when water builds up. Timer drains are more customizable, float drains are more “set and forget.”
Can I install an auto drain myself?
Yes. Most auto drains are plug-and-play, using standard NPT fittings. You’ll need basic tools and sometimes wiring for electronic models.
How often should a compressor be drained?
Without an auto drain, daily draining is recommended. With an auto drain, the system takes care of it automatically on schedule or when water builds up.
Will an auto drain fit any compressor?
Most auto drains use standard 1/4″ or 3/8″ NPT connections, making them compatible with almost all air compressor tanks.
Conclusion
An auto drain is a small investment that protects your compressor, saves time, and ensures clean, dry air for your tools. For most users, the Ingersoll Rand Electronic Auto Drain is the best all-around choice. If you want a budget option, the Mann Filter Timer Drain delivers excellent value, while the Wilkerson Pneumatic Drain is unbeatable for industrial applications.
Stop worrying about moisture buildup—install an auto drain today and extend the life of your compressor.