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OEM Flanged Sight Glass Borosilicate Glass Sight Flow Indicator. Real-Time Visual Monitoring: Offers full 360-degree transparency to observe color, clarity, and consistency, or to spot foreign particles and air bubbles. Durable Materials: Transparent tubes are crafted from high-grade materials like tempered borosilicate glass or acrylic for thermal and pressure resistance. Robust Enclosure: The glass is typically encased in a protective stainless steel or PVC housing, often featuring safety grids or double-nut tensioning to prevent over-tightening. Seamless Integration: Uses standard connections (such as flanged, threaded, or sanitary Tri-Clamp) to fit easily into existing industrial, hygienic, or plumbing lines.