Ready for installation on existing ANSI or DIN standard flanges, this bolt-on 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 USL13, Wiper Type I, and a spray ring.