That seems to be what it is too. The vac lines with the one way check valve are part of the circuit from the vac source. The "T" is installed I believe just above the Vac actuator and the rest of the line exits the firewall on it's way to the water valve. Congrats to both of us. These parts are somewhat rare in usable condition. I have about 27 " from the control side and the same length coming from the vac source to the control. I believ I cvan rebuild what I need using new line and a green paint pen and a white paint pen.