This item replaces the 500-546 and IT40. Insulating hot feed wires that are strung overhead or underground. Looking for a safe and secure way to insulate overhead or underground hot feed wires? Look no further than here! This insultube has several uses in your electric fence system. Our Zareba® 50 Foot Insultube is used to insulate fence wire under gates, driveways, or jumper wire between fence strands. It can also be used as a corner post insulator for temporary electric fences. Designed for 12-1/2 gauge wire, it can accommodate up to 9 gage wire. This insultube is rated for 20,000 volts and comes in a 50 foot roll.