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.
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