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Our sight glass is ready for installation on existing ANSI or DIN standard flanges. This bolt-on sight glass unit consists of a base with a raised face flange to fit standard ANSI Class 150 flange nozzles. Sizes range from 2 to 8″ and all conform to ASTM standards. The glass disc, either borosilicate or quartz, is clamped in place by a gasketed glass retainer held by threaded bolts.

For added safety, use a METAGLAS Safety Sight Glass disc in place of the conventional glass. Other options include lights, such as the LumiStar1000Wiper Type I, and a spray ring.

This L.J. Star product carries Canadian Registration Number (CRN) registration.

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Bolt-On Sight Windows fit a standard ANSI Class 150 flange nozzle. Standard sizes range from 2″ to 8″.

Materials of Construction

  • Standard alloys – 316 stainless steel; carbon steel
  • Standard gasket materials Gylon 3504
  • Standard Window Material Tempered borosilicate glass
  • Units Full ANSI Rated
  • Models available with METAGLAS® option for high pressure
  • PFA lining available for added corrosion resistance
  • Optional glass protection shields
  • Mica and FEP

Bolt-On Sight Window 

Pipe Size DimensionA           B           C Approx. Wt. (Lbs.) Working Pressure (Psi.)
2” 6” 2” 2-1⁄8” 7 150
3” 71⁄2” 3-1⁄16” 2-1⁄2” 13 150
4” 9” 4-1⁄16” 2-3⁄8” 18 150
6” 11” 6-1⁄16” 2-15⁄16” 27 150
8” 13-1/2” 8-1⁄16” 3-15⁄16” 43 150


The specifications contained herein are subject to change without notice and any user of said specifications should verify from the manufacturer that the specifications are currently in effect. Otherwise, the manufacturer assumes no responsibility for the use of specifications which may have been changed and are no longer in effect.