EASY ENOUGH FOR A 4 YEAR OLD? Milwaukee M12 Compact Tire Inflator Review
Milwaukee M12 Compact Inflator 2475-20 Review! Let's see if my 4 year old can use it to air up some car tires... Here's the tool: https://www.milwaukeetool.com/Products/Power-Tools/Specialty-Tools/2475-21XC
Rated to deliver over 120PSI, The high efficiency motor and pump top-off car tires in under 1 minute.