Crankcase Ventilation Filter, Donaldson P636072 Equivalent: WAU 489605, CAT 164-6735, Available FREE Shipping on orders over $2000 Login for price Description Technical Information:Outer Diameter: 177.03 mm (6.97 inch)Inner Diameter: 53.56 mm (2.11 inch)Length: 245.36 mm (9.66 inch)Type: VentilationCross Reference:Caterpillar: 164-6735Perkins: SEV1222Waukesha: 489605