>>It could be something as simple as the part that fits into the flange
(rubber stopper) or the tube that measures the airflow. I have one that my
husband made for me from parts at the auto store years ago. <<

The rubber stoppers appear to be equal. I *did* examine the metal tubing for
diameter and it was difficult to tell if there was a difference between the
two; there may be. But why? Why would one kit require a different diameter
than the other if that is the case? I'd like to understand what is going on.

Lisa

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