An adapter for the purging of lines is described that comprises a plate and an attachment mechanism. The plate includes a first side and an opposed second side that are connected by at least one edge. The plate has a first interface defined on the second side that is adapted to connect to a portion of a cap of a filter assembly in a close fitting relation. The first interface is also adapted to define an interior space between the portion of the cap and the plate. The interior space is in fluid communication with a first line that is connected to the filter assembly. The attachment mechanism secures the plate and the portion of the cap in the close fitting relation. The plate includes a second interface that is adapted to connect to an external source of pressure. The second interface is in fluid communication with the interior space.