I leak tested my PVC res yesterday. Since I didn't apply the Goop properly, it was just pissing!
The ID of my airtrap is 1 7/8 inch. I've got a top mounted fill hole and cap (not assembled yet).
Since the tube is quite large, I was wondering about using a carbon filter, to keep the "growies" out.
Sorry to hear that the DD res isn't working for you. I never liked the design myself.
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