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FYI - The breather I used was the Watchdog 39134 I seem to recall that it was under $50. Here's a link to the MFG's page with spec's etc.
https://www.tricocorp.com/product/watchdog-desiccant-breathers/
They also make a model that has an internal check valve only allowing .3 psi in / .3 psi out...
Similar to what Zed254 referenced I use this type of breather. I installed a shutoff valve between canister and my Aux tank so I can close it when not in use which extends the life of the desiccant.