The function of the waterstop is to prevent moisture from penetrating (flowing and diffusing) and to make and install a strip. It is generally used for construction joints or post-casting belts or pipes passing through walls (slabs) in waterproof areas. .Usually it must be crossed. It is usually made of 300~500MM wide steel plate or rubber plate. Now there are also ready-made rubber waterstop strips (circles) for sale on the market. You can choose the method of rubber stopper according to the specific requirements of the project and the drawing requirements. According to its purpose, this product can be used as a waterstop for deformation joints, represented by B; suitable for use as a waterstop for construction joints, represented by S; suitable for use as a waterstop for joints with special aging resistance requirements Indicated by J. The function and principle of rubber waterstop. The quality of rubber waterstop meets the requirements of GB18173.2-2000. The middle-buried rubber waterstop and back-attached rubber waterstop take advantage of the high elasticity and compression deformation characteristics of rubber. Elastic deformation occurs under various loads, thereby effectively tightening and sealing, preventing leakage, water seepage and shock absorption and buffering of the building structure. It is widely used in underground concrete expansion joints in sewage treatment plants, water plants, dams, hydropower stations, etc.