An annular cap for covering a lumen including first and second elongate members each having inside and outside surfaces, proximal and distal end portions and two opposite longitudinal edges. The cap having an interlocking snap member positioned between and connected to the first and second elongate members along the opposite longitudinal edges, the first and second elongate members being pivotable with respect to each other about a pivot axis. The elongate members interlock over and around the lumen to provide complete enclosure of the lumen when the cap is in a closed position.
