Watertight Diecast Aluminum Enclosures Hammond Manufacturing's 1550W Series Diecast Aluminum Enclosures are light duty and easy to machine, but tough, electronic instrument enclosures. Lap joint construction with a self-adhesive and an EVA foam gasket for the lid provide protection against access of dust and water. The unpainted versions have no sharp edges and the black versions are painted only on the exterior. The Hammond Enclosures 1550W Diecast Aluminum Enclosures meet IP66.