Mechanical Monica
Not content with just stuffing air in on the push, this also stuffs it in on the pull, so you do it twice as fast, right? Err, no, not really. Pushing has got your weight behind it, pulling is generally more of a struggle and the air volume delivered is small. That said, it's good value and really well made: the T-bar handle eases the pull and the double head is great if you're doing inflation duty for a group of assorted valves.
VERDICT
Very clever and cracking value, but not strictly necessary
