Drain pipe 1
Bridge drainage pipes can be divided into two types based on their external dimensions: circular drainage pipes and rectangular drainage pipes; The commonly used ones are a total height of 420mm, a large mouth inner diameter of 215mm, a small mouth inner diameter of 100mm, and wall thicknesses of 5.5mm.7mm.8mm.10mm What are the common specifications for rectangles, 125? 400mm .160? 447mm.125? 300mm .125? 510mm.125? 600mm .160? 585mm, etc
