Covers general-purpose nonmetallic outlet boxes, device boxes, covers and supports widely used by the consumer. Facilitates the pulling of wires, to protect and facilitate wiring splices and taps, to provide a means of mounting and protecting wiring devices and to provide a connection for nonmetallic sheathed cable, nonmetallic tubing, rigid nonmetallic conduit, and electrical nonmetallic tubing or other approved raceways.