Abstract: A retainer plate connects first and second fluid lines to spaced apart first and second ports in a manifold. The retainer plate has first and second openings spaced apart the same distance as the ports for receiving the respective first and second fluid lines. A fastener secures the retainer plate to the manifold with the first opening aligned with the first port and the second opening aligned with the second port. The fastener is eccentrically located so that it cannot be secured to the manifold with the first opening aligned with the second port and the second opening aligned with the first port, thus insuring that the two lines are not connected to the wrong ports.