... 1.Through the ISO9001 certification 2.10 years pipe production management 3.Application to land drainage ... pipelfarmland ,Water conservancy ooze and drainage pipe lroads , Highway ooze and drainage pipe lgreening tube. Product Specifications: Diameter mmSG50SG63SG75SG80SG110SG160SG200structure ... features: ladopts wave structure, reduce the weight of pipe, at the same time, improve the stiffness of the ...