IEB4F EO Underwater Pluggable Connector . The EO series is a underwater pluggable connector. It is specifically designed to push all the water out of the connector when you connect it underwater. This makes it a very useful connector for underwater applications Eaton underwater-mate connectors (formerly Electro-Oceanic and Watermate) are rated for operation up to 20,000 PSI and are designed specifically for mating of contacts that are de-energized and submerged. This comprehensive range of connectors includes: In-line, bulkhead, miniaturized, and hermaphroditic form factors. 1 to 8 contacts rated up to 440 VDC and 175 amps.