Bests & Worsts Reviews from Amazon

I've had a lot of problems with this unit. The inflator attachment which connects to the presta valve is threaded, which could enable you to screw the inflator to your tube before releasing the gas. However, whenever I unscrew that attachment, the valve of the tube unscrews with it and I lose all the gas and render the inflator and tube worthless without pliers ( see picture). I have tried not screwing it on but it always seems to give me problems, whether because it doesn't make a good seal as it inflates or it still attaches enough to unscrew the valve as I try to remove the inflator. I have limped along with this for too long but am going to find something new.