Replace your intake fitting on the Macro Aqua M-50 Hang on back portion skimmer with this custom made fitting which prevents fish, snails, anemones, and other creatures from getting into your pump and drying/ braking the pump. Made from aquarium safe plastic, this item is perfect for any fish tank. 
 
To install, remove the small white fitting on the pump which has the nub for ht airline tubing. Remove airline tubing from this plastic piece. Now slide on this cover and re-attach airline and you are done!