A faulty air compressor unloader valve can cause the compressor to stall out, but replacement valves are readily available ...

Able to inflate everything from beach balls to car tires, this surprisingly versatile little air pump runs off any 12V cigarette lighter. Plus: Killer deals on sport earphones and a password manager.

Otherwise, the Fanttik X9 Pro functions similarly to a full-sized digital air compressor. Just connect the hose to your tire valve, check the current tire pressure on the LCD display, ...