Businesses in the oil tanks category supply, install and maintain tanks used to store heating oil, diesel and other fuels. They may provide plastic or steel tanks in a range of designs and capacities, including bunded tanks with an outer layer to contain leaks. Services can include advice on choosing a suitable tank, delivery, positioning and installation, as well as connecting or replacing fuel lines and fittings. Customers may also use these businesses for tank inspections, cleaning, repairs and upgrades to existing storage systems. Work can include checking for corrosion, damage or leaks, replacing valves and gauges, and improving the tank's base or supports. Some providers arrange the safe removal and disposal of old or damaged tanks, or the cleaning and decommissioning of tanks that are no longer needed. The work required depends on the tank's condition, location and intended fuel use.