304 Stainless Steel Tubular Sight Glass

The 304 stainless steel tubular sight glass consists of 304 stainless steel cast end fittings, a high-strength borosilicate glass tube, PTFE gaskets, and tension bolts. Installed in process pipelines, it provides clear visual observation of medium flow, liquid level, color, and impurities. The borosilicate glass offers good pressure and temperature resistance with high transparency, while the stainless steel body resists weak acids and alkalis. Easy to assemble and disassemble with reliable sealing, it is widely used in petroleum, chemical, water treatment, food, hydraulic, and lubrication systems. Custom lengths and threaded or flanged connections are available.

304 stainless steel tubular sight glass

Overall view

Length measurement

End view

Threaded connection detail

Specifications

**Table 1: 304 Stainless Steel Tubular Sight Glass Specifications**
Parameter	Specification
Product Name	304 stainless steel tubular sight glass
Body Material	304 stainless steel (CF8)
Glass Material	Borosilicate glass
Gasket	PTFE
Connection	Threaded (standard) / flanged
Thread Sizes	G1/2, G3/4, G1, G1½, G2; NPT 1/2, 3/4, 1, 1½, 2 available for export
Standard Viewing Length	100, 150, 200, 250, 300 mm; customizable
Nominal Pressure	PN16 (1.6 MPa)
Working Temperature	-20 °C to +180 °C
Applicable Media	Water, lubricating oil, oils, weak acid and alkali solutions, food fluids
Installation	Horizontal or vertical pipeline installation
Structure	Tie-rod compression design for quick glass tube replacement, with a large, clear viewing area

Application

Hydraulic & lubrication systems. Monitoring lubricating oil flow, air bubbles, and loss of oil flow in lubrication stations and pipelines; suitable for use with oil level gauges.
Petrochemical. Visual monitoring of light oils, solvents, and mildly corrosive media in process pipelines.
Water treatment. Monitoring water flow and chemical mixing in dosing and circulating water pipelines.
Food & beverage. Visual monitoring of juice, syrup, and drinking water pipelines; 304 stainless steel meets basic hygiene requirements.
Mechanical equipment. Visual monitoring of inlet and outlet pipelines for air compressors, cooling systems, and heat exchangers.

An array of tubular gauge glass is vertically placed on the desk.

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