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MVE uses a stainless steel platform on a riser base to create a vapor platform for each freezer that has a 'wide' mouth opening, which is used for keeping your racks above a certain liquid level line. Each freezer has a different sized platform, so please pick the platform for your specific freezer. Heights are typically determined by MVE, however, if you have a specific height in mind, please contact us for a custom platform, which can be built quickly and to the same specifications.