Used 1000 Sq.ft. horizontal Shell and Tube heat exchanger. U-Tube. Shell rated 75 PSIG @ 850/-20 deg., 316-SS Tubes rated 75 PSIG @ 650/-20 deg. Passes: Shell - 1, Tubes - 2. (169) 3/4" OD x 16' L U-tubes. Mfg by Krueger Eng & Mfg Co, S/N: 94-0550, NB # 2870. (Qty - 4 available)