FUEL FILTER Replaces: Hus 503 44 32-01, 503-4432-01, 5018776-01, 5018776-02, 5021618- ... 01 For 3/16" fuel line FUEL FILTERReplaces: Hus 503 44 32-01, 503-4432-01, 5018776-01, 5018776-02, 5021618 ... , & 394 Pro (165R, RX, 244RX) fuel filter (Replaces Hus 503 44 32-01)