2 Inch Black round vent. The tabs allow for easy installation, simply insert the vent and fold down the tabs. This can be installed in thin walled material, such as plastic bins (sterilite, rubbermaid, etc).
This is great for reptile cages! Why spend hours drilling or melting holes into sterilite or similar containers? Drill one 2 inch hole and put in the vent cover and you are all set! The tabs also mean they can be easily removed for cleaning!