Fulfills its function 1 2

The pump itself seems fairly robust (only "stuff" plastic supposed to hold the pump in the closed position are of poor quality, one of the two having already disconnected the pump body). It is nevertheless regrettable pronouncement squealing at each pumping system.

Similarly, I can not find the system very convenient screwing the valve, although presumably it is more reliable and effective to prevent air leakage.

To inflate a car tire, a single piston is tight (you need of pumping!), But it works correctly. In my opinion, better focus the version 2 piston for such use, even if we eventually reach the same result with only one (with a bonus a good exercise for the calves!)