this post was submitted on 30 Apr 2026
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it isn't anymore but was common to run from a trunk to the appliance before flexible tubing showed up.
source: I have copper gas lines in my home as well as flexible appliance lines. copper was phased out because of the amount of prep required to install vs flexible tubing. also flexible tubing is less prone to having it's joints leak due to it being less rigid.
It depends on where you live, here in the Netherlands these days some plastic flexible tubing is used, but about 15-20 years ago this wasn't allowed and it was copper tubing everywhere. A little longer ago it was also soldered tubing only, they changed that because a lot of gas lines run below floors in older houses and soldering with a burner is dangerous there. Anyway, if you have a house which was built before 2000, you probably have copper gas lines over here.