Patent ID: 7470383

Claim:
A method of manufacture of a single piece polyvinyl chlorine (PVC) pipe for connection to a similar PVC pipe comprising the steps of: extruding said pipe into a predetermined interior diameter; cutting said pipe to a desired length, said pipe having a male end and a female end with said male end having a substantially uniform circumference; forming first and second enlarged interior diameters at said female end by inserting a die into the female end; said second enlarged interior diameter terminating said female end and being (a) slightly larger in diameter than a male end of a similar adjacent pipe; (b) having sufficient length to provide lateral strength when connected to said similar adjacent pipe; and (c) being at least long enough to receive most of the engaging threads of a male end of said similar PVC pipe; cooling said female end with water while the die is inserted in the pipe; internally threading the first enlarged diameter; and externally threading said male end.