DC4M Underwater Circular Series Connector Dummy Plug 4 Pin Contact male The Circular series offers the ability to combine signal and power within a single connector. Circular connectors are manufactured from high grade chloroprene rubber with different types of body material and feature a high depth rating. The connectors are available in different standard shell sizes with contacts rated at 300 to 600 V up to 5 to 10 A. For easy integration with systems and equipment, Circular connectors are available with dedicated cables, locking sleeves, pressure proof dummy connectors and other accessories.