Like Jim says, it is almost impossible to get past the baffles with a bore scope. The drains are right by the finger screens and made it easy to check them.

In my model 5 the wing drain fitting screws right into the fiberglass. That is why I am reluctant to do this every year. It would be nice if there was a threaded brass fitting put in there when the tanks are manufactured so we can remove the drains without worrying about ruining the threaded fiberglass.

FYI I used Fuel Lube when I reinstalled the drain fittings.