It’s still available for sale at Lowe’s for $359.
Genuine Campbell Hausfeld replacement part, this item is sold individually. When you use a compressor the air that is compressed inside the tank will condensate and leave water inside the tank.
If it is left in the tank too long it can start to rust out the inside of. Petroleum based epoxy and polyester based thermoset resins can be used to produce high-quality polymer concrete.