Made with a special synthetic rubber diaphragm, the product ensures stable operation for a wide range of liquid flow. There is very small difference in the pressure before and after the valve. The simple structure minimizes the parts that move during operation, reducing the likelihood of breakdowns caused by impurities and making it easier to maintain. The main body of the product for air, water or liquids is blue. Approved leakage for disks/ sheets: Less than 0.05% of the standard liquid flow