Pyrex glass disc D35 De Dietrich 721396600

A Pyrex glass disc with a diameter of 35mm is a heat-resistant viewing window used in boilers and burners to visually monitor the flame or combustion process. Made from durable borosilicate glass, it withstands high temperatures and thermal shock. This disc is a common replacement part for sight glasses on heating equipment. Installing a new Pyrex glass disc ensures clear visibility and safe operation during burner maintenance or boiler inspection.