The function of the rubber joint is simply to seal the medium, and the purpose is to prevent the medium inside the rubber joint from leaking out. The medium is the liquid substance in the transmission system of the rubber joint, so the function of the rubber joint in the pipeline is to absorb shock and reduce noise. The burrs of the rubber joint are too large, and a mold is often used during production. After molding, it needs to be poured out of the mold. In many cases, the single sphere rubber joint will have burrs after the mold is released, and the output and input ends of the rubber joint have sealing devices.