Thanks to a observation by Lee B. (trims30) I have listed the wrong nozzle part # for the DBW 2020. You need to have the .6 GPH nozzle part # 341304.
If you have the .35 GPH nozzle (which was listed in my handout), this is designed for the DBW 2010. This nozzle will work with the DBW 2020 but will run lean, which is not beneficial to the system.
Sorry for the confusion.
Mike