Yes, single in from intake source and two out. One line goes to the headlight switch and the other to the large resevoir under the left front fender. If the "space capsule" is leaking all the air from the system will bleed back into the intake when the engine is shut off causing the headlight doors to open. I have a replacement space capsule available for $25 plus shipping.I have the same problem with my 69. Does the "space capsule" have one vacuum line from manifold going in and two lines coming out? If that is the culprit, who has a replacement? I've also heard the tank could be leaking. Is that a possibility? If the motor is leaking can that be repaired? BTW, I'm new to Cougars - sorry for the dumb questions.