Machine inserted corporation stops were developed by Hieronymus Mueller in conjunction with his development of the drilling and tapping machine used to make pressure taps in water mains. During the development of the machine inserted corporation stop, Mr. Mueller designed an inlet thread which became known as the MUELLER or "CC" thread. This thread form was eventually adopted by the American Water Works Association and is listed in ANSI/AWWA Standard C800 as the AWWA Taper thread.
MUELLER Co. pioneered other design concepts in the waterworks industry such as the copper flare connection, MUELLER 110® Compression Connection and the MUELLER ORISEAL® Valves, which use O-ring seals to assure leak-tight performance.
MUELLER Co. offers corporation stops in three designs: machined key (commonly referred to as ground key), ORISEAL type (1-1/2" and 2" sizes only) and ball type.
All three designs are available with a wide range of inlet/outlet combinations including the MUELLER 110 Compression Connection and Pack Joint Connection. These three designs are all compatable with the MUELLER line of drilling and tapping machines, and small drilling machines.