I've got a Wrench Floor Pump with a dual presta-shrader pair of holes on the head and a valve internal to the head that switches between holes. I thought the valve was controled by whichever hole had something to clamp on. The pump sometimes fails to switch to the correct hole-I thought it was a case of intermittent failure. Yesterday, I noticed the pump switches to shrader if I hold the holes facing up when unpressurized, presta if the holes are facing down-although it sometimes needs a tap to get the valve to switch over. Once pressurized, it seems to lock into whatever valve type was started from depressurized.
Is this the way this pump is supposed to work, or have I got some funky intermittent failure going on here?
If this is a common malfunction, is there a remedy?
Is this the way this pump is supposed to work, or have I got some funky intermittent failure going on here?
If this is a common malfunction, is there a remedy?