Abstract: A cap attachment system for securely and electrically attaching the primary metal components of an air/oil separator to one another comprises a plurality of unique metal clips and mating retainer strips used in conjunction with a tubular, perforated metal cylinder, or “cage;” and two cap members, namely, a flanged ring top and an end cap. Three of the retainer clips, spaced equidistant as around a circle, are connected to an inner side of the cap, as are three additional clips connected to an inner side of the ring top. Three of the retainer strips, bent to have the same radius of curvature as the cage, are connected to an inner surface of the cage equidistantly along its bottom edge. Three more retainer strips are likewise connected to the inner surface of the cage along its top edge.