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Ordered as 4MRF1, this is a Reflex Gauge Glass. The gauge glass provides a flat, pressure-rated viewing window for liquid level indication.Borosilicate gauge glass is specified here for precision-formed bore and wall thickness, clear, direct visual indication of liquid level. The material holds up against thermal shock, internal pressure, and chemical attack from water and steam. It should not be specified for service in mechanical impact or abrasive cleaning.Maintenance and OEM teams specify it across water treatment, food and beverage processing, and process tanks and vessels.Order part number 4MRF1, sold individually. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.