FeaturesRevolutionary patented design expands from 2 to 3-1/2 in for while-in-use needsHeavy duty die cast metal constructionPatented Quick-Fit keyhole mounting system allows installation in under a minutePre-configured for GFCI with patented Knockout technology for alternate devicesLockable tabPremium powder coatNEMA 3R rated8-in-1 configurationExpandable cover