Locking cap system

A lockable pipe cap comprising:

• an inner cap comprising a portion of a pipe closure comprising an outer surface;
• an outer cover covering substantially all of said outer surface of said inner cap;
• said inner cap and said outer cover being selectively coupled by an axially translatable traveler, said traveler axially translatable between at least a first unlocked position and a second locked position;
• said traveler being movable between said first position and said second position by a lead screw, said lead screw being rotatable by an exposed end of said lead screw, and said exposed end being accessible from an outer surface of said lockable cap;
• said traveler being engaged with both said inner cap and said outer cover when in said first unlocked position such that rotation of said outer cover can be used to thread said inner cap onto a pipe to be closed by said lockable pipe cap;
• and
• said traveler being engaged with only one of said inner cap and said outer cover when in said second locked position such that said inner cap and said outer cover are independently rotatable when said traveler is in said second unlocked position and such that said lockable pipe cap cannot be removed from the pipe to be closed by rotating said outer cover.