4 Inch Stainless Steel Sight Glass — SS304

A sight glass is an inline viewing window that allows operators to visually observe fluid flow, color, or clarity within a pipe or vessel. A level gauge, by contrast, is used to measure the quantity or level of liquid inside a tank or vessel. Sight glasses are used for flow monitoring; level gauges are used for inventory or fill-level monitoring.

The sight glass body is constructed from 316 stainless steel with a borosilicate glass viewing window. Borosilicate glass offers outstanding chemical resistance, thermal stability from -40°C to 500°C, and is compliant with FDA 21CFR and 3-A Sanitary Standards, making it suitable for pharmaceutical, food, and chemical processing environments.

The Tri Clamp End Cap Sight Glass is rated for a maximum operating pressure of 150 PSI. This makes it suitable for most standard industrial, food processing, and pharmaceutical pipeline applications. Always verify your system's operating parameters against the product's rated specifications before installation.

Yes. The sight glass features a seamless tri-clamp end cap ferrule design, making it fully compatible with any standard tri-clamp sanitary line, clamp, and gasket. This ensures easy integration into existing sanitary piping systems without requiring additional adapters or specialized tooling.

Yes. The borosilicate glass is pharmaceutical grade and complies with FDA 21CFR177.2600 and 21CFR177.1550. The materials are also approved under 3-A Sanitary Standards and USDA guidelines, making this sight glass appropriate for pharmaceutical, biotech, dairy, food and beverage, and USDA-regulated processing facilities.

The Tri Clamp End Cap Sight Glass is available in five sizes: 1.5", 2", 3", 4", and 6". This range accommodates a variety of pipeline diameters used in sanitary processing systems across pharmaceutical, food and beverage, chemical, and industrial fluid handling applications. Pricing starts from $60.00.