GASKET: THICKNESS 1 MM, SIZE ID 20 X OD 30 MM, MATERIAL V6501, SHAPE ROUND, HOLES NONE, APPLICATION SAFETY RELIEF VALVE, Manufacturer: FUKUI SEISAKUSHO CO. LTD., Manufacturer Drawing: 20120 2996-01-2 Rev: UNK, 20120-0709-03-2, 20120 1309-03-2 Rev: UNK, Equipment Serial No: 20120 0709, 20120 1309, 20120 2996, Equipment Model No: REC161, REC261, REC561