Rectangular & “D” Ended Sight Glass

  • Mounting:

Welded or flanged onto tank wall.

  • Nominal Sizes:
Rectangular: Various lenghts available from 170 x 70 mm offering a view of 120 x 18 mm to 1000 x 70 mm offering a view of 4 x 204 x 18 mm
D-ended: Depending on nominal pressure, offering an uninterrupted view from 121 x 15 mm up to 725 x 50 mm.
  • Operating Pressure:
Rectangular: 16 bar and vacuum.
D-ended: 2.5 / 6 / 10 / 25 bar 


  • Operating Temperature:
  • Sodium Silicate – up to 100°C 
Borosiliate – up to 243°C
Base frame in stainless steels 316Ti (1.4571) or 321 (1.4541) or boilerplate
Cover frame: As base frame
Seals: Neoprene, KLINGERsil C4400, PTFE, Viton
Base frame in stainless steel 316L (1.4435), boilerplate or Hastelloy
Cover frame in stainless steel 304 (1.4301), boilerplate or Hastelloy
Seals: KLINGERsil C4400, EPDM, Silicone, PTFE
Glass to DIN 8903 or 7081. Transparent for D-ended units, fluted (Reflex) for rectangluar units.
Download Datasheets: 
Vetrolux Rectangular Sightglasses 
Vetrolux “D” Ended Sightglasses 

VETROLUX D-ended, elongated sightglass type LSGRR​

VETROLUX rectangular sightglass type RSGRR