I have a machinery house benchtop unit. I made rubber seals that sit in holes that I cut on each side wall so I can pass a barrel and action through. My recommendation would be to pull it apart when new and put it back together with a good silicon or other seam sealant adhesive in every panel joint as mine leaks at every join, other than that its a pretty decent unit for the price. We use the same ones at work for specific alloys and blasting grits to avoid cross contamination on sensitive stuff, so I have seen 3 of them last in an industrial environment for 6 or 7 years now.
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