The environmentally sealed washer (ESW) prevents contamination and corrosion, improves performance, more durable. Reduce the chance of galvanic corrosion.Sure-Bond Environmentally Sealed Washers are designed to provide a reliable electrical connection or ground while also offering environmental protection. They are particularly useful in outdoor or harsh environments where exposure to moisture, dirt, or other contaminants could compromise the integrity of the connection. Using these washers help