I bought some floplast liners and a length of pipe. The liners seem abit slack in the pipe. They have changed floplast 15mm pipe recently. At least the markings have changed on it. So not sure how the liners will feel when I cut in to the pipe. If I was concerned about the liners being abit slack. Would a compression tee be an option to cut in to get me to copper/polypipe. Thanks.