Anyone who has one is it normal to have to pump fast to get it to seal? Slow pumping doens’t appear to do much and is easy (air not going into valve). Pump faster the resistance increases and air goes into the tyre.

Can’t say I’ve noticed. Assuming presta and pushed on enough?

Had mine a couple of weeks and also noticed that. I have since realised that it just needs to be pushed onto the valve a bit more.

Yeap presta. Should be pushed far enough. I’d worry about snapping the valve if I pushed more.

Emailed oneup and they suggested its not normal so service kit on the way. Getting into the inflator head without mullering the alloy was interesting!