Head-to-head · Best Portable Tire Inflators

Milwaukee M18 Inflator (2848-20) vs Viair 88P

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

Verdict is reader-supported. As an Amazon Associate we earn from qualifying purchases. Some links on this page are affiliate links — if you click through and buy, we may earn a small commission at no extra cost to you. Our ratings are sourced from independent publications, not sponsors.

The short answer

Milwaukee M18 Inflator (2848-20) comes out ahead by a narrow margin (4.6 vs 4.4). The gap is mostly about Milwaukee M18 tool owners and pros who want the fastest, most accurate cordless tire top-off — read the strengths below before deciding.

Higher ratedRanked #1 in Best Portable Tire Inflators

Milwaukee M18 Inflator (2848-20)

4.6

3 sources2 derived$197.97as of Aug 1

Already in Milwaukee's battery ecosystem, or just want the fastest and most accurate cordless top-off available? The M18 2848-20 is the inflator to get. Pro Tool Reviews and Tool Box Buzz both rank it near the top of the category. Watch the total cost once a battery and charger go in the cart, and note there is no 12V backup.

Strengths

— Fastest cordless inflator tested, topping off an F-150 tire in about 52 seconds
— Highly accurate digital gauge with auto shut-off, within ~2 PSI of a manual gauge
— Runs noticeably quieter and lower-pitched than rival cordless inflators

Watch-outs

— Tool-only price plus an M18 battery and charger makes it the most expensive pick
— Heavy at around 9 lb with a battery attached
— No 12V backup if the battery dies, unlike hybrid Slime/AVID units

$197.97 · Check Price on Amazon Full review →

Ranked #3 in Best Portable Tire Inflators

Viair 88P

4.4

2 sourcesall derived$89.89as of Aug 1

Trucks, RVs and off-road rigs that get their pressures reset often are what the Viair 88P is built for. GearJunkie's testing had it filling tires in roughly half the time of the next-fastest unit, and Pro Tool Reviews named it best for trucks. There is no auto shut-off and it connects by battery clamps, but for serious heavy-duty inflation it is the value workhorse.

Strengths

— Crushed the competition in truck-tire testing, filling a 215/70 R16 from 10 to 45 PSI in about 3 minutes
— 120 PSI ceiling and a 25-minute duty cycle handle off-road and 33-inch tires
— Long 16-foot heavy-duty rubber hose with a quality brass chuck reaches all four tires easily

Watch-outs

— No automatic shut-off, so you must watch the gauge to avoid over-inflation
— Gets hot, up to about 160F after roughly 12 minutes under load
— Clamps connect to the battery, more involved than a 12V plug

$89.89 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Milwaukee M18 Inflator (2848-20)

The fastest and most accurate cordless pick here, ahead of the hybrid Slime Cordless Pro Power and the budget AVID Power on speed and precision. Unlike the corded Viair 88P it needs no 12V outlet, but it also lacks their 12V fallback and costs the most once a battery is added.

Viair 88P

The heavy-duty speed champion, faster on big truck tires than the cordless Milwaukee M18 Inflator (2848-20), the hybrid Slime Cordless Pro Power and the budget AVID Power. It shares the corded, battery-clamp approach with older corded inflators but reaches a higher 120 PSI for 33-inch tires.

Specs side-by-side

Spec	Milwaukee M18 Inflator (2848-20)	Viair 88P
Max PSI	150	120
Power Source	M18 RedLithium battery	12V battery alligator clamps
Accuracy	Within ~2 PSI	—
Fill Time	~52 sec (6 PSI top-up, F-150)	—
Weight	~9 lb with battery	~5 lb
Auto Shut-Off	Yes, digital preset	No
Max Tire Size	33 inch	33 inch
Material	Plastic	—
Dimensions	14.7"L x 7"W x 8.3"H	—
Voltage	—	12 volts_of_direct_current

← See the full ranking of best portable tire inflators