We combined the CPC back shell and extension into one durable shell. A 3/4” pipe thread watertight grommet is standard on CPC connectors. Snakes are in a 12 pair format with the last sequence of digits in the part number indicting cable length. RAMTECH® offers standard lengths but custom lengths are available. RAMTECH® standard for this product would be sockets to pins (female to male) to allow cables to be extended from end to end.