A swaging tool is provided for swaging a fitting and joining two tubes together, especially fittings in difficult-to-access areas. A removable head of the tool holds a first die stationary with respect to a second die moved toward the first die by a double piston arrangement within the tool cylinder....http://www.google.es/patents/US5069058?utm_source=gb-gplus-sharePatente US5069058 - Swaging tool
