GRE is the first and only one composites valve manufacterer in Thailand. We offer Foot Valve, Wafer Check Valve. Y-Strainer, Ball Check Valve. Flap Gate and Basket Strainer. The key highlight benefits of composites valves are that they are light in weight so that it required only 1 or 2 person in installation. Composite Valve is not rusted even though it is always contacted with water, salinity or chemical.