Abstract: A plumbing fitting attachable to a wall that defines an opening, comprising a tubular part sized to project through an opening, there being grooving associated with the part; a cover extending in registration with the grooving; and a retainer caused by the cover and projecting to locally engage the grooving, thereby to position the cover in relation to the grooving.

Abstract: A retention system for holding and mounting a cover cap to a plumbing fitting having a tubular terminal that projects at an opening through a bath or shower wall, comprising a retainer ring fitting on said tubular terminal and tightenable toward said wall, a series of retention cams on said ring and space about a longitudinal axis defined by the ring, there being gaps between successive cams, and there being retention shoulders on the cams, the retention shoulders facing in directions toward said wall, for retaining holders on the cover cap, after said holders have been passed longitudinally through said gaps and after the cap has then rotated to cause said holders to slidably engage the cams and became wedged against said retention shoulders.

Abstract: A retention system for holding and mounting a cover cap to a plumbing fitting having a tubular terminal that projects at an opening through a bath or shower wall, comprising a retainer ring fitting on said tubular terminal and tightenable toward said wall, a series of retention cams on said ring and space about a longitudinal axis defined by the ring, there being gaps between successive cams, and there being retention shoulders on the cams, the retention shoulders facing in directions toward said wall, for retaining holders on the cover cap, after said holders have been passed longitudinally through said gaps and after the cap has then rotated to cause said holders to slidably engage the cams and became wedged against said retention shoulders.