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The AstroAI AC21BK is a 12V DC portable tire inflator with a digital gauge, LCD screen and preset auto shut-off at up to 150 PSI. It runs on a 6600mAh lithium-ion battery and includes a 10 ft power cord, an emergency LED light and nozzle adapters for bikes, balls and inflatables. Its best new price is $19.99 at Walmart as of November 7, 2026, with 5 stores listing it new.
In stockSold by AstroAIReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
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Availability unknownSold by doodahdeals (99.8% positive, 26,200 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
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Lowest price we've seen: $31.99 on Nov 7 at The Home Depot. Tracked across 3 stores since Nov 7.
Rated 4.2 out of 5 from 821 ratings, owners mostly like the preset auto shut-off and the easy digital gauge. Complaints center on noise and the cooldown limit on longer jobs.
Experience fast and reliable tire care with this Portable Tire Inflator Air Compressor, designed for high-performance emergency and everyday inflation. Featuring a maximum working pressure of 150 PSI and a strong airflow of 17L/Min, this 12V DC electric car tire pump utilizes a durable metal gear and solid cylinder to deliver enhanced stability and prolonged operation up to 15 minutes before cooling. Equipped with an accurate digital pressure gauge and clear LCD screen, it easily switches between 4 measurement units (PSI, KPA, BAR, KG/cm²) for real-time monitoring. To ensure maximum safety, the smart auto shut-off function automatically turns off the pump once your preset tire pressure is reached to prevent over-inflation, while the built-in emergency LED light provides bright visibility in dark roadside conditions. With its compact, lightweight design and a 3-meter (10ft) power cord, this portable auto air pump easily reaches all four car tires for hassle-free storage in your trunk, making it an ideal car accessory for travel, road trips, and essential car maintenance. Complete with versatile nozzle adapters, this multi-purpose tire inflator for car tires is also perfect for motorcycles, bicycles, sports balls, pool floats, and other inflatables, serving as an easy-to-use, beginner-friendly automotive air pump for every vehicle owner. The perfect gift for your loved ones on Birthdays/Thanksgiving/Christmas/New Year's and other holidays. Specifications: Working Voltage: DC 12V Power Source: Corded Electric Power Rating: 120W Inflating Speed: 17L/Min Maximum Working Pressure: 150 PSI Continuous Operation Time: 15 Minutes Material Type: ABS Plastic, Metal Inflation Hose Length: 2.13 ft (65 cm) DC Power Cord Length: 9.84 ft (3 m) Dimensions: 5.78x 6.69 x 3.11 in (14.7x 17x7.9 cm) Recommended Uses: Ball Inflation, Tyre Inflation for Car Motocycle Bike Item Highlight: Preset Pressure Auto Shut-Off LED Light Fast Inflation, 150 PSI Compact Air Pump for Car Tires, Motorcycles, Bikes, Balls, Long power cord LED light Package includes: 1x AstroAl Portable Air Compressor 2x Air Nozzles 1x Needle Valve Adapter 1x Replacement Fuse 1x Presta to Schrader Adapter 1x User Manual
