... 3-high quality 20# DIN carbon steel pipe end cap Nominal Pipe SizeDNOutside Diameter at Bevel DBack to FacesLimiting wall ... 052922924512.7about us Zhonghao steel pipe sales Co.,Ltd. of Cangzhou is a pipeline, pipe and tube fittings products ... include: seamless steel pipe, straight seam steel pipe, spiral steel pipe, welded steel pipe, elbow, tri -elbow, different-diameter pipe, bebded pipe, flange, etc ...