MD50-3H the first generation 160 m/min high speed labyrinth type ... middle layer, it can be use recyle material, down the cost, inner and out layers is new material, occupy ... than 20%. So its outside is smooth, sand hole. The filter net device is two-path struture, it is ... than other labyrinth irrigation pipe machine. The winder is with automatic cuting device, so the operation is easy. 2. total ...