15mm ID 25mm OD 2m length
just get sum grey lagging a juinor kacksaw and sum duct tape.
cut the lagging at a 45degree angle when you get to the compression elbow, the rest of the lagging needs to go on. you can cut out the lagging so you can fit it around the new stopcock then just tape the joints up so there is no gaps. hope this helps! 🙂