Plug has a moisture proof sealing ring to keep out spray & make it seat firmly in the outlet and features an ON" indicating LED, and a built-in 10 Amp fuse Socket features a watertight cap, easy installation and interlocks with the plugDesigned to withstand the rigors of wet environments and constant vibrationLarge contact surfaces for good electrical connectionTwist lock system-plug locks securely into socketInternal strain relief and cord sealNickel plated copper alloy used for all current carrying componentsFront panel, rear panel, or surface mount