The acrylic version is suitable for temperatures up to 80 degrees Celsius and for non-aggressive media.The soda lime version can be used up to 150 degrees and is also suitable for more aggressive media. In the borosilicate glass version, the devices can be used for chemically very aggressive media at temperatures of up to 300 degrees Celsius. The flow sight glass is designed for intermediate flange mounting. The dimensions correspond to the sealing gasket of the respective flange. So no separate metal housing is required and observation of the flow from any angle is possible. Especially with larger nominal sizes, the intermediate flange mounting of the sight glasses results in a better price-performance ratio compared to stainless steel sight glass fittings. The sight glass rings are available in different sizes 24, 30 or 50 mm made of the materials acrylic, soda-lime or borosilicate glass, which are clamped between two existing flanges.