Dish washing machine pump and drain

Claim 1

IN A DISH WASHING MACHINE COMPRISING AN UPPER WASHING COMPARTMENT AND SPRAY MEANS THEREIN SAID COMPARTMENT HAVING A BOTTOM WALL PROVIDED WITH AN OUTLET OPENING, A SUMP UNDERLYING SAID BOTTOM WALL IN SEALING ENGAGEMENT THEREWITH AND HAVING AN INLET OPENING ALIGNED WITH SAID OUTLET OPENING, SAID SUMP HAVING SIDE WALLS AND A BOTTOM WALL WITH A BOTTOM DRAIN OPENING AND AN ADJACENT VALVE SEAT, A VERTICALLY ADJUSTABLE OPEN ENDED DRAIN TUBE ALIGNED WITH SAID DRAIN OPENING AND VALVE SEAT AND EXTENDING THROUGH SAID PUMP AND UPWARDLY THEREFROM INTO SAID COMPARTMENT, A PUMP COMPRISING AN IMPELLER CHAMBER WITH AN INTAKER OPENING THROUGH A SIDE WALL OF SAID SUMP AND AN IMPELLER IN SAID CHAMBER REMOVABLE THEREFROM THROUGH SAID INTAKE OPENING INTO SAID SUMP, SAID PUMP HAVING A DISCHARGE CONNECTED TO SAID SPRAY MEANS, SAID TUBE HAVING AT ITS LOWER END A VALVE ELEMENT COOPERATING WITH SAID VALVE SEAT TO CLOSE SAID DRAIN OPENING TO THE INTERIOR OF SAID SUMP WHEN SAID TUBE IS IN ITS FULLY LOWERED AND CLOSED POSITION, MEANS FOR MOVING SAID TUBE TO ITS SAID FULLY LOWERED AND CLOSED POSITION AND TO AN UPPER OPEN POSITION WITH SAID VALVE ELEMENT SPACED ABOVE SAID VALVE SEAT EFFECTIVE FOR OPENING THE INTERIOR OF SAID SUMP TO SAID DRAIN OPENING, ANOTHER SIDE WALL OF SAID SUMP HAVING AN ACCESS OPENING OF A SIZE TO ACCOMMODATE PASSAGE THERETHROUGH OF SAID PUMP IMPELLER, AND A COVER PLATE FOR SAID ACCESS OPENING REMOVABLY MOUNTED ON SAID OTHER SIDE WALL.