The Crouse-Hinds EDSC2129 3/4-Inch Single Gang Factory Sealed General use Snap Switch is a feed through, dust ignition proof and explosion proof type switch. It is rain tight and can be used in wet locations. It has a 3/4-Inch hub size and is made out of electrogalvanized aluminum acrylic painted feraloy iron alloy. Approval UL 894, CSA C22.2. Also known as -Crouse-Hinds EDSC2129 EDS FS Snap Switch 1 Gang Feed Through