When keeping animals in tubs whether stand alone or in racks the main key to prevent chewing is that there is no groves or ridges. If there are it will be the starting point for you rats to chew their way out and of course once a rat learn to chew it's way out it must be euthanized immediately before he teaches other rats to do so.
You also want to provide a piece of 2 x 4 o they can chew it instead of trying to chew tubs.
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