A junction box for electrically connecting a furnace to a service panel and providing power and control signals to fixed appliances. An internal makeup water header which includes a pipe having spray nozzles arranged counter-current to the flow of steam introduced by the steam inlet is used to introduce heated makeup water into the exhaust stream from the turbine within the condenser. Thus, with the implantable prosthesis being a stent-graft used to treat an aortic aneurysm ), the skirt may be used to inhibit Type I endoleaks upon its selective displacement in response to irregular aortic shaping andor aneurysm neck expansion. In one aspect of the invention, tunnel mapping is performed between Layer 2 Tunneling Protocol ingress and egress tunnels.