Abstract: A plumbing end cap for sealing an end of a selected pipe having either a first outer diameter or a second outer diameter includes a fluid impervious base for overlying the end of the selected pipe. The end cap also includes an endless wall fixed to a perimeter of the base and configured to seal the end of the selected pipe. The endless wall is pivotable between a first configuration to fit the first outer diameter and a second configuration to fit the second outer diameter.