Milwaukee M18 Inflator 2848-20 to the test to see if it really is the best cordless tire inflator on the market. I bought this inflator because I’m always looking for a faster, better, and easier way to adjust the tire pressures on my cars. Below I’ll walk you through what I love about it, how I use it, and a few things that aren’t perfect.
Why I Bought the M18 Inflator
“I’m always looking for a faster, better, and easier way to adjust the tire pressures on my car.”
That pretty much sums it up. I wanted a portable, powerful inflator that would make changing tire pressures quick and painless — especially when prepping cars for track days, or switching between summer and winter pressures. The Milwaukee M18 looked like the right tool: cordless, compact, and using the same batteries as my other Milwaukee tools.
Key Features That Stand Out
- TrueFill™ technology & Auto Pressure Check: Ensures you hit the exact PSI target and shuts off automatically to prevent overinflation.
- Memory: Stores up to four tire pressures and retains them even if the battery is removed — handy for vehicles with different front/rear pressures or multiple cars.
- Performance: Can pressurize up to 150 PSI and pumps tires up very quickly — faster than other cordless inflators I’ve used.
- Onboard storage and accessories: 36-inch hose, inflator nozzle, needle, Presta adapter, and storage for those items.
- Stability: Rubber feet keep it steady while inflating so the unit doesn’t “dance.”
- Warranty: Five-year warranty gives extra peace of mind.
How I Use the Inflator — Step-by-Step
There are two main ways to use this tool: manual and memory-based automatic inflation.
Manual Inflation
- Attach the hose to the tire valve.
- Press and hold the main button to start inflating.
- Watch the pressure readout on the unit until it reaches your target PSI.
- Release the button to stop.
Memory-Based Inflation
- Program the desired PSI into one of the four memory slots (front/rear or different cars).
- Attach the hose and select the memory slot.
- The inflator will run and automatically shut off once it reaches the programmed PSI — no babysitting required.
The automatic shutoff is a real convenience — especially when inflating multiple tires or when you’re trying to get exact pressures for track sessions.
Real-World Performance
In everyday use the unit is impressively fast. The compressor pumps air quickly into the tires, and the TrueFill™ auto pressure check gives confidence that you won’t overshoot the target PSI. The 36-inch hose lets you reach all four tires without dragging the whole unit around, and the rubber feet help keep it stable during inflation.
What I Don’t Love (and What You Should Know)
- Price: It’s not cheap — and that’s especially true if you need to buy the battery and charger as well. If you already own M18 batteries, the cost is much more reasonable because you can buy the bare tool.
- No built-in work light: There’s no integrated illumination for night work. For me this hasn’t been a deal-breaker, but it’s worth noting.
Who Should Buy This Inflator?
If you’re a DIY enthusiast, club racer, or weekend track-day driver who needs fast, repeatable, and portable tire inflation — this tool is aimed at you. It’s especially compelling if you already own Milwaukee M18 batteries. If you only need occasional inflation and don’t already have M18 batteries, you might find less expensive alternatives.
Quick Specs & Practical Notes
- Max pressure: 150 PSI
- Hose length: 36 inches
- Memory slots: 4 (retains settings without battery)
- Technology: TrueFill™ with Auto Pressure Check
- Warranty: 5 years
Verdict
The Milwaukee M18 Inflator 2848-20 is a premium cordless inflator that delivers speed, accuracy, and convenience. Its ability to store multiple pressures, auto shutoff, and the power to quickly fill tires make it a standout tool for serious car enthusiasts. The main downsides are price and the lack of an integrated work light, but if you value time and precision — and especially if you already run M18 batteries — this inflator is a strong buy.
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Final Tips
- If you have other Milwaukee M18 tools, buy the bare tool and save on cost.
- Program memory slots for each car or for front/rear differences to speed up routine checks.
- Keep the Presta adapter and needle in the onboard storage so you’re ready for bikes or sports equipment.
- Use the automatic shutoff for consistent pressures when prepping for track days.
If you want a deeper dive into how I set tire pressures for track days, check my other write-ups and videos where I cover pressure targets and strategies in detail. Have questions or want to share your experience with the M18 inflator? Leave a comment — I’ll respond.
