JR Series Water-Proof Circular Connectors Hirose JR Series High-Performance Water-Proof Circular Connectors are also corrosion resistant, making the JR Series ideal for use in adverse environments (IP67). A smooth connection is assured by the five guides. The JR Series is available in a variety of shell sizes and core numbers, as well as numerous cable clamps. Hirose JR Series High-Performance Water-Proof Circular Connectors are featured in machine tools, FA-related equipment, communications equipment, and many other electronic equipment and devices.