Patent ID: 8020899

Claim:
A coupling for connecting a male end of a first connecting polyvinyl chloride (PVC) drop pipe that has external threads disposed thereon to a second connecting PVC drop pipe, said coupling comprising: a substantially cylindrical first female end with a non-threaded lead in section and an internally threaded section adjacent said lead in section; said internally threaded section having internal threads for mating with said external threads on said male end of said first connecting PVC drop pipe; said lead in section being of sufficient length to provide lateral strength when said first connecting PVC drop pipe is connected; said lead in section having an enlarged interior diameter as compared to the interior diameter at the crests of the internal threads of said internally threaded section, wherein said interior diameter is slightly larger than the external diameter of said male end of said first connecting PVC drop pipe; said lead in section terminating in a first leading edge; said lead in section having an enlarged exterior diameter relative to the exterior diameter of said internally threaded section; an interior diameter at the radially innermost portion of said first leading edge which is substantially equal to the interior diameter of said lead in section adjacent said internally threaded section; a substantially cylindrical, non-threaded second female end adjacent said internally threaded section and opposite said first female end; and said second female end having an interior diameter that is slightly larger than the external diameter of said second connecting PVC drop pipe.