28mm 29mm 30mm 31mm 32mm 33mm 34mm 35mm 36mm 37mm Outside Diameter OD 3mm Thickness Black NBR Rubber Seal Washer O Ring Gasket 28mm 29mm 30mm 31mm 32mm 33mm 34mm 35mm 36mm 37mm Outside Diameter OD 3mm Thickness Black NBR Rubber Seal Washer O Ring Gasket. Sale price : $6.28 Category : Home Improvement