Interlube-filled pressure gauges with patented Sub-Z freeze-proof isolators are a must for all fire apparatus. The stem and Bourdon tube are filled and sealed with a special low-temperature material which prevents water from entering the tube and freezing.

• All Class 1 gauges meet or exceed ANSI and NFPA standards.
• Class 1’s internal breathing diaphragm eliminates the need for a large air bubble in the mid-range of the gauge which can distort readings.
• All fire gauges feature "internal breathing" diaphragms to compensate the case for changes in internal case pressure.
• Customized dials are available