Discontinued Product. Corrugated Grey Water Hose 25Mm X 10M 25mm Corrugated Sullage Hose 10m Roll Corrugated Black Flexible Waste Hose , tough and durable waste hose with a "smooth" inner lining to prevent clogging. Very flexible and retains its shape for tight turns with 25mm internal diameter in a 10mtr Roll. Specifications Length: 10 meters ID: 25mm Will connect to existing 25mm barb of 25mm OD pipe. Needs to be heated in hot water to fit most 25mm barbs Smooth Bore.