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10/50Pcs NBR O Ring Nitrile Rubber Gasket Thickness CS 3mm OD 9~150mm Black Round O Type Corrosion Oil Resist Sealing Washer 10/50Pcs NBR O Ring Nitrile Rubber Gasket Thickness CS 3mm OD 9~150mm Black Round O Type Corrosion Oil Resist Sealing Washer 10/50Pcs NBR O Ring Nitrile Rubber Gasket Thickness CS 3mm OD 9~150mm Black Round O Type Corrosion Oil Resist Sealing Washer