Plastic (PMMA) glass, resistant to temperatures up to 80°C.
NBR rubber (PERBUNAN).
White plastic.- Execution A: without level limit indicator mask.- Execution B: with red oil level limit indicator.
For installing GN 537 oil level sights no screw thread is required.The oil level sight is inserted into the hole d1 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 use is limited to non-pressurised or even slightly pressurised tanks.