"JGalban wrote

Previous versions of the 172 ('84/'85) had wing tanks with no
obstructions
in the bottoms. The new version had wet wings, which is what prompted the
installation of drains outboard of each rib in the tank area.

And all of those extra drains could have easily been eliminated if the
engineers would have done a hours worth of work redesigning the ribs to
enlarge or add crossover points in the ribs, so all of the water could get
to the lowest point in the tank.

This has to be an example of why things are screwed up in the industry,
don't you think?
--
Jim in NC