Originally Posted by
alcjphil
The trick to getting going with a pretsa valve is to, once you have opened up the knurled nut is to tap it lightly to burp a bit of air out. Then attach the pump head to the valve and start pumping, works every time. If you don't do this, the valve is often stuck closed and it might take well over 100 psi to break the seal. Good pump heads are not difficult to connect to the valve
Yeah, I used to do that but that is the whole point. It is another thing you have to do to get the things to work. I finally got a good pump with one of the most efficient pump heads I have seen but engaging the Presti and getting a good seal is harder then the Schrader. Especially after all the darn air has left the tube while trying to engage the Presti.