Flexible spill containment sumps fold for less expensive shipping and easy storage. Fuel tanks are large. So it stands to reason that spill containment for them will be even larger. That's great when your tank is leaking: not so great when you're trying to transport or store the sump. The Flexible Model Containment Sumps use a very durable material braced by L-brackets to effectively contain leaks, drips, and spills. But when the sump needs to be moved or put into storage, the brackets can be easily removed and the material folded up.