131-8822 Outer Diameter 237 mm (9.33 inch) Inner Diameter 130.9 mm (5.15 inch) Length 330.2 mm (13.00 inch) 131-8821 Outer Diameter 134.6 mm (5.30 inch) Inner Diameter 94 mm (3.70 inch) Length 322.8 mm (12.71 inch) Efficiency 99.9 Efficiency Test Std ISO 5011 Family FRG Type Primary Style Radialseal Brand RadialSeal邃「 Media Type Cellulose