The kayfun is the easier as you don't have to use wire with no/low resistance leads. Have 1 and two on order. My fave RBA. Kayfun lite smaller no adj airhole and a bottom fill hole. Kayfun lite Plus adj airflow and smaller. Kayfun 3.1 full size adj airflow side fill hole options also on size. All of these can go SS or plastic tanks.
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