314 sq. ft. STAINLESS STEEL SHELL and TUBE HEAT EXCHANGER. Rated for 150 PSI/FV @ 366 deg. F. -32 MDMT. (600) 1/2 inch OD x 48 inch long tubes. 4 inch tri-clamp fitting on each head. Shell has a 1.5 inch threaded fitting and on the pipe coming from the shell, a 3 inch flanged and 3 inch threaded with a relief valve. Stainless steel tubes and shell. Possibly 316 or 316L (will check). Was part of a steam generator. Mfg by Paul Mueller Co. in 2000, S/N: 4152200-1, NB# 30374.