Sorry to return to an old post but saves starting a new one. My Discovery came with a Southdown already fitted but its drawing air in throught the join between the flexi pipe and metal snorkle. I have stripped it all down, the flexi pipe was pushed into the snorkle, is it better off to put the pipe over the outside of the snorkle and jubliee and then seal. only thing is it seems a tight fit between the plastic wing fixing and the metal tube, or is there another way to get a good air tight connection?