Changsha, Hunan, Jiangsu Thai spring half-pipe drainage technology products available all year round for many construction units, each unit has received praise, welcomed patrons ensure cheap Ω type semicircular canal common specifications specifications TY50mm, 80mm, 100mm, height 25 -40mm, 45-50 mm, 55-60mm Ω-type semi-drain, half pipe, Ω-type drains, sewer tunnel semicircle semicircle Ω drain type, also known as semi-circular tube, Ω-type drains, drainage pipes semicircular tunnel . It is made of high strength steel wire spring hard by phosphoric acid rust treatment, after the outer coating PVC coating wrapped with geotextile composite membrane made of semi-circular thermal bonding drains.