The Push Frame Fit features a ‘hidden’ valve that supposedly protects it against the weather – not that I’ve ever had any weather-related valve failures. The upshot is that it’s about 6cm from the end, which makes it impossible to hook your finger around the end of the pump to brace it against your pumping action, like you’d normally do. This results in a Karma Sutra-esque frenzy of position changes while you try to find a comfy one.
I didn’t, and by 105psi my arms had given up. Oh, and the valve leaked too.