The GTP-2518-3-5 Gammon Technical Products 3.5 Gallon Graduated Plastic Test Bucket is made with a conductive (aluminum) electrostatic bonding device to collect static charges so they can be safely carried away, using the bonding cable (included). Note the bonding lug at the top for use in membrane tests. This device also serves as a level indicator. The operator can clearly see the fuel level as it reaches the notches which are at accurately calibrated levels. Plastic buckets are not approved as standard “white buckets.”