Premix burner tube SSB-399 mesh type

Premix burner tube SSB-399 (mesh type), part number 7738006275, is a field-service replacement component for Buderus SSB commercial boilers with premixed combustion systems; its mesh-style premix form is intended to support consistent air–fuel mixing and stable flame characteristics to maintain OEM combustion behavior during service and parts staging. I could not locate a dedicated Bosch product page for part 7738006275 on Bosch North America sites, so this description is based on SSB-series documentation and Bosch premix burner references. (bosch-homecomfort.com)