And the siphon assembly itself. The black line from the bottom is the pressurized fuel supply from the pump. It goes through the siphon and then out the other black line that attaches to the bottom of the main module cup. The siphon itself fits into the top of the siphon cup with an O-ring seal. As fuel flows through the siphon it pulls a vacuum on the siphon cup tp pull fuel from the RH side of the fuel tank.