This is a tough, nylon, 100A 125/250V shore power inlet, most frequently mounted in the boat's cabin side or cockpit coaming.
Gray inlet has a gasketed, spring-loaded cover providing an IP-67 watertight rating (withstands temporary immersion) when tightened.
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm.
www.P65Warnings.ca.gov