UNUSED approx. 57 Sq. Ft (5.33 Cu. Meters) graphite block heat exchanger. Manufactured by Carbone, model Graphilor 110/55, serial number 7794, built in 1990. Rated 75 PSI & full vacuum @ 360 degrees F on service and process sides. National Board number 891. Shell 18" OD x 7'9" long.