This system has as main advantage over traditional single system bonding rubber ring, that all those facilities that work with medium runoff fluids flow, test boards watertight, is performed only on the boards and not the entire pipe, thus saving water, flooding of the trench, etc.. adding to this, the cost of these operations entail. The two rubber rings will stay at the outlet pipe, at a certain distance between them, which should be related to the diameter of the pipe, between the two rings threaded valve is installed, from which the fluid inlet is conducted (o agua care), Testing after, will be placed a screw cap, Covering valve.