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Sight Glass Disc DIN 8902 is also named round sight glass and circular gauge glass, which is made from tempered soda lime glass. It is used to observe and illuminate the interior of closed pressure vessels like tanks, silos and other similar installations.
Aluminosilicate Sight Glass Disc is also named round sight glass and circular gauge glass, which is made from aluminosilicate glass. It is used to observe and illuminate the interior of closed pressure vessels like tanks, silos and other similar installations.
Quartz Sight Glass Disc is also named round sight glass and circular gauge glass, which is made from high purity quartz glass. It is used to observe and illuminate the interior of closed pressure vessels like tanks, silos and other similar installations.
Sight Glass Disc DIN 7080（seventy eighty ） is made from special formular borosilicate 3.3.（three point three） It is used to observe and illuminate the interior of closed pressure vessels like tanks, silos and other similar installations.
