This 3 layers Round Drip Irrigation Pipe Machine, is used to produce round drip pipe with 3 layers. Its layers distribution: 10%(outer layer)+80%(middle layer)+10% (inner layer). New materials is for inner/outer layer, recycled raw materials was applicated for middle layer,which can largely reduce the materials cost,and also can get elegant inner/outer layer surface. Pipe Diameter: 12mm,16mm,20mm