Ideal for use in commercial fuel tanks, domestic heating oil tanks and bulk diesel tanks to prevent corrosion. Condensation causes water to collect in the bottom of fuel tanks which if not removed corrodes the inside of the tank. The water soaker is lowered into the fuel tank and secured with the attached cord, the nylon bladder absorbs any water in the tank until fully expanded in the mesh filter leaving the fuel oil, diesel or petrol in the tank. Simply leave the soaker in the tank until the bladder is full of water, then remove and replac. Dimensions diameter x length 56 x 300mm, absorbency capacity 489ml.