Carlon's Mud Boxes are the preferred choice for applications in concrete pours and decks. They are nonmetallic and noncorrosive which extends product life, eliminates rust & the need for replacement, & provides safe handling/installation. They are concrete tight and contain molded integral "Quick Connect" connectors to satisfy any jobsite application. The Snap-In Design means no taping is required. The mud box assemblies can be used for literally any device from fire alarms to data jacks.