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To anyone wanting to change over to 2-micron filter; some experiences that I am living. The part number passed around on the forums, S3220S UL, does not include the sediment bowl; only the replacement element. If you're starting from scratch and looking for the assembly that screws onto your mount you need the clear bowl, P/N RK30475, in addition to the element. Unfortunately, the only assembly part number available is for the filter element and steel bowl not a clear bowl (so I'm told).