I have a project and I have been trying to figure out a way to join PVC parts together. I took a couple of pictures of product that did this but I am not sure of the exact mechanism or part. I wasn't sure if this was some sort of rivet, plastic welding, or insert. I am looking at the rings in the pictures. The rings do not go all the way through to the other side of the two pieces of plastic. [ATTACH]2354[/ATTACH][ATTACH]2355[/ATTACH]