Title pretty much says it all. I picked up a few cases with good designs and seals for a great price. They probably aren't as durable as a Pelican or Starlight case but they will work for what I want to do. They lack a pressure equalizing valve and since I plan to have them in varying tempratures, I think it wouldn't hurt to drill the cases and install equalizing valves like you'd find on Pelican cases if they aren't to expensive. Now that I'm looking, I can't seem to find them, but I'm thinking I'm not looking in the right places and I probably don't know the right brand/key term to search for.

Any one happen to know where I can find them?

Thanks

breather valves

https://www.mcmaster.com/products/breather-valves/

Would these work?

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