A borosilicate sight glass fused to a metal ring. A unique combination of glass and metal places the glass in compression, creating an amazingly strong and reliable sight glass. METAGLAS® is the No. 1 selling sight glass, installed in more locations around the world. Clamp-style, bolt-on, weld-on, and threaded models available. L.J. Star is your borosilicate sight glass supplier!
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