To enable the PE Tracer to be inserted into live PE mains, via a standard Service Tee, a system has been developed that enables the cutter to be removed, and a guide tube, complete with a directional foot, to be installed under live no blow conditions. The guide tube has a low pressure glanding system as standard, but can be supplied with a medium pressure glanding system ( suitable for use at pressures up to 2 bar ) if required. Once the tracing operation has been completed the guide tube can be removed and the cutter replace, all under live no blow conditions.