The H5600A 1/2-in. by 3/4-in. pressure-relief valves are now available with 400 psig pressure settings. Matching rupture disc assemblies, also with 400 psig pressure settings, are available to indicate which pressure-relief valve has discharged. The valves are designed to provide emergency relief from excessive pressure in refrigerant-containing vessels. After discharge, these valves will attempt to reseat to minimize loss of refrigerant. Hansen Technologies Corp., 6827 High Grove Blvd., Burr Ridge, IL 60521-7579. Tel. (630) 325-1565; fax (630) 325-1572;