The Fisher Labs CCLAMP3 3 ft. Coupling Clamp for Line Tracers work with any Fisher Labs model of Utility Line Tracer to facilitate conductive tracing. In some cases a utility may be exposed, but does not provide a direct connection for the conductive tracing cables. The accessory coupling clamp can be clamped around the exposed utility to magnetically couple an energizing current from the accompanying transmitter into the utility.