UltraTech Containment Sump 1000: With 3 4" Drain 2831 Operation Type Push Button The bottom door of the The bottom door of the unit is kept shut tightly with a spring loaded hinge Container Type: Cart SPCC and EPA Container Storage regulation 40 CFR 264 Contains 1000 gallon fuel tanks1 piece molded polyethylene design will not rust or corrodeNestable design saves freight and minimizes storage spaceOptional 3 4 drain fitting available allows use with Ultra SelfBailer2 drain fitting also availableUse with optional Ultra Self Bailer (Part# 9935) for outdoor containment Self Bailer allows clean stormwater to passively drain from sump while capturing hydrocarbons