Sigma Engineered Solutions 1-gang while-in-use receptacle cover allows an outlet to be used while the cover is closed. The durable non-metallic construction prevents moisture penetration making the boxes suitable for wet, damp or dry locations. The cover has 16 configurations and comes with 3 different adaptor plates, a pre-installed gasket and hardware. This cover is adaptable for GFCI, duplex, switch and round devices (1-1/4", 1-3/8", 1-9/16", 1-3/4", 2-1/8"). The patented corner hinge allows for vertical and horizontal installations and makes for one less setup step. Plus, the cover is lockable to restrict unwanted access and keep electrical safety a priority.