Sight glass body: Aluminum, turned, with bright finish
Sight glass: ESG glass
Retaining ring: Stainless steel, European Standard No. 1.4310 (American Standard 301 series)
Seal: FPM rubber (Viton®)

The European guidelines for explosion protection introduced on 7/1/03 (ATEX) also cover explosion protection in the mechanical sector.
Fluid level sight glasses GN 743.6 are suitable for use in an explosion risk environment, and comply with guidelines 94/9/EG. Detailed documentation accompanies this part when ordered.
Other features include:
1. Genuine glass of high stability and scratch proof.
2. Sealing with an O-ring on the periphery and not on the face edge of the glass. Leak tightness is therefore not affected by axial pressures.
3. Seal is housed in a groove and therefore cannot be lost. Meanwhile, this groove prevents the seal from being extruded when the sight glass is tightened. The location of this seal also allows the use of a softer Elastomer, which guarantees better and easier sealing.
Heat resistance: -20°C (-4°F) to 150°C (300°F).
Note: When mounting fluid level sight glasses on walls of less than 4mm thickness, use nut GN 543.1.

See our Technical Section for pipe thread size details and pressure ratings.