The NEER Oh Nem III (NONIII) is an anemone and fish guard that is designed to fit a Nero 3 wavemaker pump by Aquaillumination (Link to the pump & specs.
The guard is sleek and effective at protecting important livestock such as roaming anemones and small fish from getting suck into the Neer 3 impeller. Running a Neer 3 without a guard puts your tank's expensive livestock at risk. Even the stockfish guard that comes with the neer 3 is not effective at protecting your livestock.