Regulation Rainwater pipe 25mm25mm x 25m HDPE Green Black Rainwater Pipe HDPE Rainwater pipe with green strips signifying Recycled Rainwater. This is required by British Standards (BS8515) to avoid any potential for cross contamination. This pipe will fit all standard 25mm HDPE compression fittings. Length: 25m Diameter: 25mm Regulation black green pipe is colour coded so that there can be no possibility of rainwater being used where purified tap water is required. The use of this