GN 537


  • Type A: without oil level mark
  • Type B: with oil level mark

Ring nut


Sight glass

Perspex (PMMA)

temperature resistant up to 80 °C

Sealing ring

Rubber NBR (Perbunan)

Contrast screen


white, with red oil level marks

This oil level glass GN 537 does not require a thread.

The oil level sight glass is inserted into the bore d2 to H11. By simply tightening the ring nut using the pin key the seal is pressed against the contact surface which, at the same time, will hold the sight glass in position. For removal reverse the procedure.

Their application is limited to non-pressurised or only slightly pressurised tanks.

  • Pin key for installation GN 537.1 (Code no. see table)

  • Elastomer characteristics 


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