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VacuumLand – Vintage & Modern Vacuum Enthusiasts

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The rainbow D4 SE should have at least 50” at most 60” of waterlift. So if it is weak than it could very well be the gasket. The separator would not have anything to do with restricting the suction unless the machine is not taken care of (which by the looks you take great care of it). The big thing with the rainbow is airflow they are never supposed to lose suction or airflow. If you would like to you could replace the basin and I can see what my cost on a used basin would be for you if you would like and we can ship it to you.


Mike


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