Watertight Diecast Aluminum, Series R190 & R191 Hammond Manufacturing offers Series R190 and R191 Watertight Diecast Aluminum Enclosures which are modern, high quality enclosures with a shallow lid, a deep body, and thermoplastic gasket. Available in a variety of dimensions, series R190 and R191 feature captive stainless steel lid screws and clip-on design covers to hide the mounting and lid screws. Hammond Manufacturing´s Watertight Diecast Aluminum Enclosures are rated NEMA 4X and IP67.