Stainless steel tube in tube flow through heat exchanger by exergy llc, model 01149-4, serial # 20983 & 20982. Features all 316 l stainless steel construction with polished pharmaceutical grade finish, inner tube is . 750" od, encased in 1" od tube for length of 38", 1/2" product inlet and outlet with tri clamp connection, heating or cooling inlet have 2" npt connections, two threaded mounting points with 1/2"/13 tpi female mountings for flush surface mounting. Formerly used as part of cooling system in personal care products lab.