We just purchased and installed a new Arnott air compressor and Arnott valve block on our 2011 BMW F11.

The instructions for installing the air lines in the valve block call for removing the old air line fitting. Then you're supposed to simply insert the airline (after removing the shipping pin) into the fitting on the valve block and "press until firmly seated". What follows then is that you're supposed to pull the airline outward to lock and ensure a secure connection.

It does not seem that the airlines will lock in place, though, and the instructions make a point of stating "do not remove or tighten air fitting on the new part".

Is this correct? Or are you supposed to tighten the air fitting after inserting the airlines (original red and blue ones)?