I have been working with Wirsbo for over13 years now. From time to time we have gotten called back to a house to change or add something. We have never had a problem taping into the original Wirsbo plumbing. I do realize that the pipe does have a little memory however mose of your memory and will come from the rings. We have never had any leaks with Wirsbo that can be blamed on the pipe. I have had leaks typing to stick the expander into a area that it did not fit and took small bites or wasted too much time shoving the joint togeter.