1. A PITLESS ADAPTER ASSEMBLY COMPRISING: (A) A WELL CASING HAVING A LATERAL DISCHARGE PORT, (B) THE BORE OF SAID CASING HAVING A SMOOTHLY MACHINED TAPERED WALL PORTION EXTENDING DOWNWARDLY AND INWARDLY FROM A POINT IN CLOSE PROXIMITY ABOVE SAID PORT TO A POINT IN CLOSE PROXIMITY ABOVE SAID PORT, (C) AN ADAPTER MEMBER CARRIED BY THE LOWER END OF SAID CASING AND DESIGNED FOR ATTACHMENT TO A SUBMERGED WELL CASING, (D) THE DIAMETER OF THE LOWER END OF SAID TAPERED PORTION BEING AT LEAST EQUAL TO THE DIAMETER OF THE SUBMERGED WELL CASING WITH WHICH IT WILL BE ASSOCIATED, (E) A PULL PIPE FOR INSERTION INTO SAID WELL CASING, (F) MEANS AT THE TOP OF SAID WELL CASING FOR SUPPORTING SAID PULL PIPE, (G) A WATER DISCHARGE ASSEMBLY CARRIED BY THE LOWER END OF SAID PULL PIPE, (H) SAID WATER DISCHARGE ASSEMBLY INCLUDING VERTICALLY SPACED, SMOOTHLY MACHINED TAPERED EXTERIOR WALL PORTIONS DEFINING SEAL MEMBERS ADAPTED RESPECTIVELY FOR NESTING AND SEALING ENGAGEMENT WITH THE TAPERED BORE PORTION OF SAID WELL CASING ABOVE AND BELOW SAID PORT RESPECTIVELY, (I) THE AREA IN SAID WELL CASING INTERMEDIATE SAID SEAL MEMBERS DEFINING A WATER CHAMBER IN COMMUNICATION WITH SAID PORT, (J) SAID WATER DISCHARGE ASSEMBLY BEING DESIGNED FOR FLOW COMMUNICATION WITH A SUBMERGED PUMP UNIT, AND BEING PROVIDED WITH A WATER OUTLET INTERMEDIATE SAID SEAL MEMBERS AND IN FLOW COMMUNICATION WITH SAID WATER CHAMBER, AND (K) MEANS IN SAID WATER DISCHARGE ASSEMBLY SEALING OFF FLUID FLOW INTO SAID PULL PIPE.