Everbilt 3/8 in. x 2 in. Black Neoprene Washer

This washer provides a tight moisture barrier to seal out liquids and gas and also help cushion the nut or bolt head. It is the same washer used in a bonded sealing washer. The package size designates the I.D. of the washer. Used in applications with nuts and Bolt or Screw where moisture prevention is a concern.