Stainless Steel Corrugated Triple Tube Heat Exchanger - 15 tubes. Initially used in food processing, these have 316 stainless steel product contact surfaces. Outer tube dimensions: 2-7/8 in. ID x 20 ft. L, total holding capacity: 6.7 gallons. Intermediate tube dimensions: 2-11/64 in. ID x 20 ft. L, total holding capacity: 3.8 gallons. Inner tube dimensions: ¾ ID x 20 ft. L, total holding capacity: 0.5 gallons. Inlets: (1) 2-1/2 in. dia. (reduces to 2 in.) S-line fittings, (1) 2 in. dia. S-line fittings. Outlets: (1) 2-1/2 in. dia. (reduces to 2 in.) S-line fittings, (1) 2 in. dia. S-line fittings. Overall dimensions: 20 ft. L x 4 in. W x 4 in. H. (ACN688).