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Sigma's one-gang in-use receptacle covers allow an outlet to be utilized while the cover is closed. They are configurable for GFCI, duplex and round devices and feature a corner hinge which prevents moisture penetration while the receptacles are in use. The corner hinge allows for vertical and horizontal installations and the cover is lockable to restrict unwanted access. These die-cast covers compliment one-gang weatherproof boxes and include hardware, gasket and adapter plates for various configurations.