I needed a new pump as my Joe Blow had blown out. I got a great deal on a Syncros FP2.0 pump, but every time I unscrew the pump from the presta valve after filling the tube with air, it unscrews the presta valve instead of unscrewing the pump from the valve. Thus, it lets all the air out.
Is there such a thing as a tube with a presta valve that does not unscrew mid-valve?
("great deal" is relative, since the pump keeps doing this...)