Have you seen Amazon where many of the ones recommended also have complaints about o-ring failure, some part of the valve breaking or no longer puncturing the cartridge seal? I would like to get one for when time is critical but if so many have had failures and the top one posted in reviews and customer recommendations, I would like something reliable that will work when needed.

If these things are so simple, why are there reports of issues? You would think the simpler something is, the less problems they could have.

If the o-rings can come out, why aren't they putting a screw in plate to hold the o-ring in place? It is not like these things just came out on the market. They should have matured by now.

Frank