811 - .75" .75" EMT Set Screw Couplings are used in dry locations to connect the ends of two .75'' EMT thin wall conduits together to extend the raceway. Set screw couplings provide concrete tight connections when taped and properly secured with the included set screws and are rated for electrical applications above 600 volts. Their heavy gauge steel construction maintains mechanical protection and solid grounding of one conduit to another.