Pre-pressurized bladder tanks. Pressured bladder tanks have several advantages over atmospheric tanks. Pressurized tanks do not require any delivery pump and are less likely to have microbial contamination versus atmospheric tanks. Holds 3.2 Gallons Specifications: Tank Volume Manufacturer Part #: Diameter x Height Connector 4.4 Gallons RO-132 Ø 11" x 13" 1/4"