To be fair they did have an air drier on the line(one of those expensive ones from HF but never bothered to drain the tanks) but other than some rust there is nothing wrong with it. He was throwing it away because originally there we had two of these connected in series but he purchased a used Quincy QT-15 120gal from someone that was going out of business and kept one of the husky's as a backup and just threw away the other as it was taking up too much space.
Also not sure if you red the original post but I have already hydrostatic tested this tank. I am just looking for a good way to get the crud out of the bottom of the tank and then give a good rust preventative coating.
I've a buddy who works at place that finals various large sculpture type items. They have a drier between the head an receiver (500ltr vertical), he rarely drains it as he never gets anything out of it, regardless of how long its left.