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APG stocks the 4MRF5, a Reflex Gauge Glass. A gauge glass delivers durable visual indication in high-pressure steam and water service.As a material, Borosilicate gauge glass is specified for annealed for consistent strength and clear, direct visual indication of liquid level. The compound resists chemical attack from water and steam, thermal shock, and internal pressure. Exposure to abrasive cleaning or mechanical impact will shorten service life.It sees regular use in food and beverage processing, boilers and steam drums, and process tanks and vessels.This item is sold individually under part number 4MRF5. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.