Gasket premix burner tube

Gasket premix burner tube (Part No. 7738004985) is a replacement sealing gasket for premix burner assemblies in Bosch gas-fired appliances, forming the sealed interface between the premix burner tube and the combustion chamber or burner housing. It helps maintain proper air–gas mixing geometry and combustion-chamber integrity, and is intended for service use by trained technicians during maintenance or part replacement. Bosch North America parts documentation did not list PN 7738004985, so this description is based on the part name and category. (bosch-homecomfort.com)