The ZEVAC is electrically bonded to the pipeline through the hoses, which are electrically continuous. If the pipeline is grounded, the ZEVAC is grounded. If the pipeline is on cathodic (or some other electrical system), we don’t want to ground out that system by grounding the ZEVAC and then bonding to the pipeline. If the user wants to bond the ZEVAC to something else (such as the ground), please be aware that the pipeline will also be grounded. Caution should be taken when connecting ZEVAC between two piping systems that have different electrical potentials (like a transmission line with induced AC, and a distribution line that is electrically isolated from it).