Is it pex or wirsbo that you have in your house? Pex uses copper rings that get crimped on after a 't' or union are inserted whereas wirsbo has a plastic sleeve over the end of the tube, and both the tube and sleeve are expanded together with a tool that looks like a rivet gun. Once expanded the 't' or union is inserted into the tube and held for 10 seconds. The expanded tube then contracts and creates the seal. The wirsbo expanding tool is stupidly expensive for what it is, but I prefer the system to pex.