Improvement design flow meter: longer side tube sizes

@franz I’m on the wait list for the availability of the flow meters. Your comment RE Gen 1 hardware is making me wonder if there is a connection between the current extended unavailability of the meters, and the possible release of a Gen 2 version.

I have a kind of tight situation with the install, and concerned that if any dimensional changes are made to the meter, which might change the installation procedure, it may cause some problems in my case.