Double-acting tamper-resistant aerator and aerator system

A tamper-resistant aerator comprising:

• a housing;
• an aerator at least partially disposed within the housing;
• an insert engaged with a portion of the housing, the insert defining at least one insert removal slot adapted to receive at least a portion of a tool;
• a locking ring at least partially disposed within the housing, the locking ring defining at least one locking ring removal slot adapted to receive at least a portion of the tool, the locking ring rotatable relative to the housing, wherein the locking ring is rotatable to align the at least one insert removal slot with the at least one locking ring removal slot;
• and
• a mating engagement between the locking ring and the housing, wherein the mating engagement is adapted to secure the locking ring within the housing, and wherein the mating engagement comprises at least one protrusion on an exterior surface of the locking ring and a corresponding indentation on an interior surface of the housing adapted to receive the at least one protrusion,
• wherein alignment of the at least one locking ring removal slot with the at least one insert removal slot forms a continuous passageway through a sidewall of the locking ring and at least partially through a sidewall of the insert.