Pipe test plugs have the bypass system to provide the opportunity for test of the pipelines during their dulling temporarily and change their fluid direction. Pipe test plugs are made from SBR+NR mixed rubber, nylon cord, kevlar cord and strong fabrics. They are able to run between -30°C and + 70°C. They are tested at the 1, 3 times higher than their working pressure and they have ultrahigh bursting pressure. Their biggest advantage is that they reach the high friction force rate in the working pressure grasping the pipe diameter at very low pressures.