Fuel Tank Adaptor Mercury 1999 plus Tank End 2980

 The tank end is the fitting that connects to the tank adaptor, also simply, the one you plug into the fuel tank. The tank adaptor first into fuel tanks only, it screws into the tank. Different brands and types of tanks have a common thread for the adaptor to screw into. The tank adaptor is permanently in place, screwed into the tank, it is the part you connect the tank end of the fuel line to.