I've had my Makita MAC2400 about 8 years now, used it mostly indoors for remodeling and some in my shed for auto repairs. I've never drained condensed water from the inside until a friend showed me this video about how rust can make them explode. I had about 1-2 oz of rusty water come out when I drained it.
How can I determine the firmness and reliability of my air compressor with regard to the rust inside its air chambers?