- Leaktight containers for the fuel retention stored in the tank in the event of its breaking or wrong transferring or handling system operation.
- They are suitable for simple wall tanks of equal to or less than 1,000 litres.
- They are stacked with lateral handles to make easier its transport and handling.
- They are made zinc-plated steel plate of 0.8 mm thickness, with non-corrosive treatment
- «The storages with capacity not higher than 1,000 litres of Class C product (diesel) do not need retention container. They must have a spill tray with capacity, at least, the 10 per 100 of the tank.» (Spanish "Real Decreto 1523/99")