... , gutter size 4"X5", downspot 3"X3", high strength, long life We ar rain drainage system is to guide the rain and ... reasonable schedule design,the main component is the gutter and down spouts.PVC drainage system is internationally common water pipe ... used in villas,garden houses,residential and office building. style:dual wall 5.2 inch,gutter size:130*103mmdown pipe size:85 ...