Extra-duty while-in-use covers keep an outdoor receptacle protected while a cord is plugged in, which the National Electrical Code (406.9(B)) requires for 15- and 20-amp receptacles in wet locations. Sealproof polycarbonate covers are rated Extra Duty, the higher impact class the code specifies for receptacles supporting general use outdoors, and are cULus Listed.

The 18-in-1 and 45-in-1 mounting systems mean one cover fits the common device layouts: duplex, decorator, GFCI, single and round receptacles, horizontal or vertical. Covers are offered in clear, gray, white, black and bronze for one- and two-gang boxes, with a lockable hasp and multiple cord openings.