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APG stocks the 4MRF2, a Reflex Gauge Glass. A gauge glass seats in a gauge frame to give a protected, direct view of process level.The material holds up against internal pressure, thermal shock, and chemical attack from water and steam. Borosilicate gauge glass is valued for annealed for consistent strength, precision-formed bore and wall thickness. Applications involving mechanical impact or abrasive cleaning call for a different compound.Maintenance and OEM teams specify it across food and beverage processing, process tanks and vessels, and boilers and steam drums.Stocked as 4MRF2 and sold individually. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.