Filter stem for use with the filter of an aquarium

Claim 1

IN COMBINATION, A FILTER COMPRISING A HOLLOW CASTING FOR SUPPORT WITHIN AND AQUARIUM CONTAINING WATER TO BE FILTERED, SAID CASING HAVING ADJACENT ANGULARLY DISPOSED VERTICAL WALLS AND A VERTICAL PASSAGEWAY AT THE JUNCTION OF THE SIDE WALLS, AND A FILTER STEM COMPRISING A TUBE EXTENDED THROUGH SAID PASSAGEWAY AND OF A LENGTH TO HAVE ITS BOTTOM END PORTION EXTENDED BELOW THE BOTTOM OF SAID FILTER INTO THE WATER OF THE AQUARIUM TO BE FILTERED AND ITS TOP END PORTION EXTENDED FROM THE TOP END OF SAID PASSAGEWAY, A HOLLOW BODY HAVING TOP AND BOTTOM WALLS MOUNTED ON THE PROJECTION TOP END PORTION OF SAID TUBE WITH SAID TOP END PORTION EXTENDED THROUGH SAID BOTTOM WALL, MEANS FOR RAISING WATER WITHIN SAID TUBE TO SPILL FROM THE TOP END PORTION OF SAID TUBE INTO SAID HOLLOW BODY, A DISCHARGE STEM EXTENDED LATERALLY FROM THE SIDE OF SAID BODY AT A LEVEL BETWEEN SAID TOP AND BOTTOM WALLS OF SAID BODY SO AS THAT THE WATER WITHIN SAID BODY CAN FLOW BY GRAVITY THROUGH SAID STEM INTO THE FILTER, SAID BODY RESTING WITH ITS BOTTOM WALL ENGAGING THE TOP EDGES OF ANGULARLY DISPOSED VERTICAL WALLS, AND MEANS EXTENDED DOWNWARD FROM THE BOTTOM WALL OF SAID BODY ON OPPOSITE SIDES OF THE AXIS OF SAID DISCHARGE STEM FORMING ABUTMENTS FOR ENGAGING THE INNER FACES OF SAID ANGULARLY DISPOSED VERTICAL WALLS RETAINING THE FILTER STEM FROM THE BEING TURNED TO A POSITION RELATIVE TO SAID FILTER IN WHICH SAID DISCHARGE STEM WOULD SPILL THE WATER OUTSIDE OF SAID HOLLOW CASING.