A hollow rubber product used for flexible connections between metal pipes. Flexible single ball rubber flexible connector is also called soft rubber pipe joint, flexible rubber joint, soft rubber joints, rubber joints, high-pressure rubber joints, rubber shock absorber, compensator. According to the connection way, we divide the loose flange type, the fixed flange type and the threaded type 3. According to the structure, they can be divided into 5 kinds: single sphere, double sphere, different diameter body, eccentric eccentric body, bending sphere and fan coil pipe. The pipe shaped rubber parts are composed of inner and outer rubber, cord layer and wire ring. After vulcanization, they are combined with metal flanges or parallel joints. This product can reduce vibration and noise, and can compensate for thermal expansion and contraction caused by temperature change, which is applied to various pipe systems.