Silicone rubber gaskets allow 1590 Series Aluminum enclosures to achieve an IP65, watertight rating (when used in conjunction w/ neoprene screw "o" rings). Hammond provides a gasket with their 1590W series enclosures. These gasket kits include 2 gaskets which can be used to refurbish a used 1590W series Enclosure or to add additional environmental protection to the standard 1590 Aluminum enclosure series.