Blue Sea Systems 12 Volt Plug This durable 12 Volt Plug from Blue Sea Systems is designed to withstand the rigors of wet environments and constant vibration. Features a moisture proof sealing ring around the shaft to keep out spray and make it seat firmly in the outlet. This plug has a large contact surface that provides a good electrical connection. ON indicating LED Strain relief Built-in 10 Amp fuse Twist lock system - plug locks securely into socket Internal strain relief and cord seal Nicke