Southwire - Topaz carries a complete line of built to last, cULus listed weatherproof electrical fittings fabricated for multiple commercial and residential applications. Designed for use with all standard outlet boxes and lamp holder covers, our weatherproof Round 4 in Box includes 4 closure plugs and grounding screws for fast and easy installation. Constructed with 1/2 or 3/4 in knockouts and featuring a 17.2 cu-in capacity, available in gray, bronze or white, UL listed for use in wet locations and ready for fast delivery.