Mirro Pressure Cooker Model “398M or M-0398”. Parts List for Mirro Matic “398M or M 0398” Pressure Cooker. Mirro® parts for the Mirro® model “398M or M-0398” may be ordered on-line using the links below. Mirro 9898 Pressure Regulator 9898$17.95 Mirro 9894 Vent Tube 9894$9.95 Mirro 9888 Metal safety fuse M9888$7.99 Mirro 9891 Gasket 9891$14.89 9 3/4 in. dia. Canning Rack 622$9.49 Stainless Steel Steamer Basket 9 1/2 in. 085665$21.99 Mirro 8 quart Model 398M or M-0398