These glass lenses are designed for use in reflex or transparent style armored liquid level gauges.
Transparent Gauge Glass is clear tempered borosilicate glass with a high degree of visibility. Reflex Gage Glass is made for extra ease in locating liquid levels. This gage glass has vertical prisms extending the full viewing length of the glass. The prism side faces the liquid. The sections of the prisms not covered with the liquid reflect light spectacularly. Therefore, the liquid level stands out very clearly from a long distance away.
The maximum recommended working pressure indicated may exceed rating of armored liquid level gauge.