Designed for direct burial but it is better to put it in a plastic pipe. Insultube is designed for taking electrified wire under gates by putting the H-T wire through the tube. It can also be used for insulating jumper wires between non-electric fence wires. Extra long tube insulators can be cut to length for stapling to wood posts or for insulating holes in wood posts when wire is threaded through them rather than stapled. It is still good to put this inside plastic water pipe and seal all the ends with electrical putty.
Some people like to use wraparoud insulators without the metal insert or flat side.
This can be cut to the length needed for ends and bends. The diameter of I48 is about the same as it is for wraparounds. This is also available in 6 inch lengths for use on line and bend posts.