5 25 50Pk Copper Crush Washer Gasket Seal 1/4 5/16 3/8 7/16 5/8
5Pk, 25Pk, or 50Pk Copper Crush Washer Gasket Seal Flat Ring Oil Plug 1/4 5/16 3/8 7/16 1/2 5/8. These corrosion-resistant copper washers compress for a tight fit and provide maximum electrical conductivity.