DU (Double Union) and SU (Single Union) are two PVC ball valves can be availed by customers. The former ball valve made from uPVC compound can be easily installed and dismantled. For this purpose, there are two union nuts at both ends. Customers are free to select the seat ring in either HDPE or PTFE to meet their high pressure applications. O-ring made of nitrile rubber is used in this valve prevent leakage. The handle of this valve is also leak-proof. This was all about DU PVC ball valve which is mainly used in irrigation. The SU PVC ball valve when installed controls the flow of water in irrigation as well as domestic water supply lines. The main difference between the two valves are only the number of union nut and connection options.