[Size]: Multiple Sizes.

[Quality Materials]: The Sightglass Tube is made of high-quality 304 stainless steel and the glass is made of high-quality borosilicate which is durable, stable, rust and corrosive-resistant, and good for a long time using.

[Precise Design]: It is designed to combine with a gasket and clamp to make a sanitary and easily cleanable connection.

[High Working Temp. & Wide Range of Applications]: The sightglass can be used to transmit medium between different systems and observe inside by glass. It is suitable for different media including water, gas, and oil with working at -58°F~482°F.

[Convenient organization and storage]: Packed in a small plastic bag with a label.