The Sigma ProConnex Plastic Insulating Bushings are used on the end of Rigid conduit, IMC and other threaded connectors to provide a smooth well rounded bearing surface to protect wires or cables when pulling. These non-metallic bushings are rated for 105C and flame retardant. Provides a smooth surface on the end of conduit to protect wires. Used on the end of 1/2-in Rigid conduit, IMC or other threaded connectors.