(2) Feldmeier Tube-in-Tube Heat Exchangers. Thickness: 0.161in. Inner tube dimensions: 2-1/2 in. dia. x 20 ft. L. Holding capacity: 5 gallons. Outer tube dimensions: 3 in. dia. x 19-1/2 in. L. Holding capacity: 7 gallons. Inlets: (1) 2-1/2 in. dia. (product), (1) 2-1/2 in. dia. (media). Outlets: (1) 2-1/2 in. dia. (product), (1) 2-1/2 in. dia. (media) Overall dimensions: 20 ft. L x 7 in. W x 3 in. H. Feldmeier Tube-in-Tube Heat Exchanger. Thickness: 0.161in. Inner tube dimensions: 2-1/2 in. dia. x 10 ft. L. Holding capacity: 3-1/2 gallons. Outer tube dimensions: 3 in. dia. x 9 ft. 5 in. L. Holding capacity: 2-1/2 gallons. Inlets: (1) 2-1/2 in. dia. (product), (1) 2-1/2 in. dia. (media). Outlets: (1) 2-1/2 in. dia. (product), (1) 2-1/2 in. dia. (media) Overall dimensions: 10 ft. L x 7 in. W x 3 in. H.