Used 137 sq.ft. horizontal shell & tube heat exchanger, Mfg. by Alabama Heat Exchanger. 316L stainless steel shell rated for 100 psi & FV @ 500 Deg. F., 316L stainless steel tubes rated for 125 psi & FV @ 500 Deg. F. Shell diameter 16" O.D., 3/4" Dia tubes x 4' long. Serial #AHE-683, National Board #369, Year Built: 2000, Previous Service: R-901 Vaports Condensers - Grignard, Estimated Weight: 1,550#