1.The gate is packed with glue wholly. Excellent tightness and reliable. Long service time. 2.Light weight, easy installation. 3.Flat base. The bottom of the valve was designed flat. It won't produce sundries or sludge. Excellent tightness and reliable. 4.Corrosion resistance. Use non-toxic epoxy resin on the inner wall to prevent from corrosion and rustiness. It can be used in portable water supply system, and also can be used in sewage treatment system.