Electric pipe is used to reposition VD wire. They are made of PVC and available in the colors crème (beige) and grey. The crème (beige) electrical tube is intended for use in the house, the grey version is impact-resistant and suitable for outdoor use.
What's there to say about pvc conduit. It just works indoor in this climate. For outdoor use, you have to protect it from the sun. By painting it over for example.