Milwaukee M18 Inflator 2848-20 — 150 PSI Cordless Tire Inflator

Real-world speed and accuracy

Independent testing backs Milwaukee's headline claim. Pro Tool Reviews measured 52 seconds to bring a Ford F-150 tire from 30 to 36 PSI — the fastest result among the inflators it had tested, ahead of Ridgid's R87044 (1:19) and Ryobi's P747 (2:19) — and noted it 'never took more than a minute' across multiple vehicles. The pump also runs at a lower pitch than most inflators, which testers found less harsh on the ears, and anti-vibration feet keep it planted while running.

TrueFill pauses to let pressure stabilize, reads the system, and fills to target before shutting off automatically. Pro Tool Reviews found it landed within 2 PSI of a manual gauge, and Garage Journal members report readings within about half a PSI of their digital gauges, crediting logic that accounts for pressure drop across the hose and valve. Toolguyd lists the spec at ±1 PSI accuracy with a 33% duty cycle at 80 PSI and an internal cooling fan rated for 20-plus minutes of runtime.

M18 vs. M12 vs. DeWalt: the platform question

The value math only works if you already own M18 batteries. Against Milwaukee's own M12 Compact Inflator (2475-20, 120 PSI max), forum users who own both say the M18 is decisively faster, runs cooler, and handles truck tires the M12 struggles with — but the M12 remains more compact and cheaper for sedan duty. DeWalt's DCC020IB counters with 160 PSI and three power sources (20V battery, 12V vehicle outlet, 110V wall power), which Toolguyd commenters repeatedly cited as the more versatile choice for a dedicated glovebox inflator.

Consumer-grade 12V and rechargeable inflators in the $40-80 range will do the same job on passenger tires, just slower and with less accurate gauges. The honest thesis — echoed across Garage Journal and Toolguyd comment threads — is that the 2848-20 is the best cordless inflator you can buy if the battery cost is already sunk, and a hard sell if it is not.

The honest downsides

The $169 tool-only price is the most common complaint — that is real money for a single-purpose tool, before batteries. It is also heavier and bulkier than the M12 at about 7 pounds bare, so it is less of a leave-it-in-the-trunk tool. The screw-on brass chuck is accurate but slower than a quick-connect and bleeds a little air on removal; Garage Journal users often add a LockNFlate or Jaco clip-on chuck. Repeated large fills will drain a standard 5.0Ah battery quickly (owners recommend 6.0Ah+ high-output packs), the 33% duty cycle at 80 PSI drew criticism from Toolguyd commenters, hose storage is an external wrap rather than internal routing, and there is no LED light or 12V fallback. A few owners also advise double-checking the gauge with a hand gauge, reporting occasional over-inflation by a couple of PSI.