Hey, im about to go out to the track, and I had a leak because this vacuum cap was not sealing good. Instead of fixing the cap I would like to get rid of this device if i do not need it. Is it a check valve?, whats the direction of flow? NOTE: I do have a line hooked up to the open port which goes to my throttle body. If its a check vavle id rather just get a generic checkvalve so I dont have to cap off the 3rd port. Thanks!