They have a new product that has been out for 20 years but due to widespread use in the past few years the price has come in line with pvc (when you calculate quality). The product goes by the name of PEX. I installed some 2 years ago but where it came out of the slab in a shed for future use I jest clamped a bolt in it and forgot about it. It was done to 12 below here last winter and I was told it would handle the freezing just fine and it did. After using it and realizing how durable it was I would never use anything else. On the subsoiler I have one made up to install electric lines, the multiple trips are a must to prepare a trench. The issue is meetinig electrical codes which require electric lines to be a minimum of 18". After customers forgetting that you told them it was only going to be 12" deep I no longer use it for other people.
The beauty of the PEX is that it comes in rolls and the fittings just slide on and are designed to increase hold with increased pressure.
I also cut sections of it this summer and made drop tubes for the seed box on my MF grain drill. I just preheated it and slid it over the ferrule on the individual drops and as it cooled it conformed tight against the nipple and held tight. If I get a chance I will try to get a picture of it.