Instruct: Classify a given Amazon review as either positive or negative.
Query: Good design very poorly manufactured

This is a great idea that I have used before to good effect.UNFORTUNATELY...This PARTICULAR device - essentially an air valve - is so poorly manufactured that it requires repair BEFORE it can be used. The plastic shell is a two-piece, snap-together affair that doesn't snap together well at all, leaving the interior valve in a warped shell that does not allow the valve to seat properly in either position.I am strongly considering sending this unit back, not for the few bucks (plus shipping) it cost me, but to make the point that there are limits to the junk Amazon.com can foist off on me.Buy another brand.