The EC2B-B32B042M2F-U from IDEC is an EC2B series, 4 holes x 2 column hazardous location control box with M20 thread size. UL certified for use in Zone 1 and 2 and certified for use in hazardous locations by IECEx (Global) and ATEX (Europe) to meet the strictest safety standards. Control box is IP65 rated and Type 4X for protection against water and corrosion. Suitable for use with EU2B series 30mm hazardous location switches.