The filter dryer I use is very similar to the one you're looking at. The ones I've cut open usually have a screens and either desiccant or zeolites for the drying material. You can dry them out with heat or vacuum. Vacuum is easier than baking them in the oven. The ones I use have the quarter inch flare fitting so I can use the myriad of AC service hoses I've collected up.
mike
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I tried to contain myself, but I escaped.
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