We've just returned from a tour around the NC500. Unfortunately the roads have taken their toll and along with the poor bracket fixing has resulted in my grey waste pipe laying by the side of the road somewhere in the north of Scotland! The fixing into the waste valve looked to have been a push fit. So I'm looking for some 40mm OD grey pipe and a couple of 90 degree bends. Has anyone had to replace this pipe as I can find 41 OD and 43 OD but not 40? I could of course turn the inside of the valve fitting (which is a screw fit to the metal body of the valve) but the original pipe must be available from somewhere.