Abstract: The present invention relates to a sound elimination structure for an air pump, especially an air pump which is used in an aquarium. The sound elimination structure includes a sound elimination device including an air chamber box, and an air chamber cover secured with each other and defining a plurality of chambers therein. The air chamber cover and the air chamber box are provided with air guide tubes, recesses, air holes co-operating with catch plates so as to increase the path of the air flow, thereby reducing the velocity of the air flow so as to eliminate the noise.

Abstract: An air pump assembly including a one-piece pump stock provided with a base portion defining a first recess for receiving a rubber cushion, the pump stock being attached to an interior wall of a pump casing by securing the base portion within a second recess formed on the interior wall by opposed inwardly directed flanges.