Those are "tote bins", "tote tanks", or "totes". They are officially called an "Intermediate Bulk Container" by the DOT. They come in various sizes and designs. The one you have pictured is designed to be used only once. They are a molded polyethylene tank in a steel frame. The polyethylene is degraded by ultra violet light (sunshine) or oxidizing chemicals. After prolonged exposure to the sun the plastic will become brittle and crack. Typically you will see the effect of the sun after 3-5 years. 8 years is probably the maximum. Generally the steel frame rusts away before the tank splits.
Companies will get liquids delivered in them, then dispose of them. People selling them probably got them from where they work. Just be careful to know what liquid was in them before and that they have been thoroughly cleaned before use.
The bottom valve may have 2" straight threads instead of tapered pipe threads. So getting a fitting to seal is very difficult. Also remember that 250 gallons of water weighs over 2000 lbs.
Hope this helps
Companies will get liquids delivered in them, then dispose of them. People selling them probably got them from where they work. Just be careful to know what liquid was in them before and that they have been thoroughly cleaned before use.
The bottom valve may have 2" straight threads instead of tapered pipe threads. So getting a fitting to seal is very difficult. Also remember that 250 gallons of water weighs over 2000 lbs.
Hope this helps