Weatherproof-electrical-box-covers-menards, update your home's electrical systems with reliable electrical boxes and covers from menards®! whether you have a weekend project or a whole house to wire, you'll find all the products you need.. Sigma's weatherproof duplex receptacle kit provides a convenient source of power for all of your outdoor activities while significantly increasing your security. the tamper resistant, weather resistant (trwr) duplex receptacle provides maximum security against accidental electrical shock and durability for long outdoor performance.