Humm...I thought I replied to this several hours ago, guess something happened.
Anyway, the Nuwa has a 50 amp cord, but after reading your post about corrosion got me to thinking. Even though it has not been used, it still is several years old, and, in checking the price of new transfer switches, I was surprised about how cheap new switches are. I would be foolish to use the old one, and possibly be installing something that might fail in a short time.
Not only that, but a new one will probably come with installation instructions.