I have a split air con unit and the external lagged pipework looks a bit rough. Is there any reason I couldn't cut a channel in the back of some 68mm down pipe and clip it over the pipes / cables that are bundled and clipped together? That way it would match the existing rain water downpipe. I would run it flush to the soffit and down to the ground for a uniform look. If thats a no go due to flamability etc then does anyone know of a large black conduit or trunking that would do the job? My google skills have let me down!