Greetings to all! This is my first post on the site. I've had several frustrating experiences with trying to source parts for my 200mm OD UPVC pipe. I need to be able to access the inside of the pipe regularly. So I've been looking for a threaded sleeve-and-cap combo (or even a threaded sleeve-and-plug combo). I have searched everywhere without success. No one seems to have anything removable to fit over the end of my 200mm OD pipe. Can someone send me to a source?