This is a big soup pot in the kitchen, connected by an inch elbow. What's its name and where can I buy it?

This problem is more complicated. Generally, there are many insiders in the kitchen. If it is a PPR water pipe, it is best to use a hot-melt elbow. Generally, the internal wires used to go out of the wall are connected to the eight-character valve. This is uncertain, so there is no definite answer. Vegetable pots are generally PPR, stainless steel, and of course copper pipes. It is best to repair it with steel pipes. I hope this helps.