When you order a McDaniel fillable gauge you may choose to fill it yourself or you may order it factory-filled with the liquid of your choice. Thus you can maximize inventory utility and minimize inventory cost.

Glycerin filling has a lower operating temperature limit of 32°F (0°C) undiluted. The mixture of distilled water in proportions up to 35% will lower the limit commensurately, to -40°F (-40°C).

Silicon can extend the lower temperature limit to -60°F (-50°C).

The maximum temperature limit is not determined by the fluid but by the gauge's synthetic case seal. At elevated temperatures the seal may bake and lose elasticity.