Class 1 gauges are "Made in the USA" by people who provide unmatched integrity and the finest service to firefighters and emergency personnel. Class 1 is recognized for innovations such as our liquid-filled pressure gauges with patented freeze proof SUB-Z isolator. 

Case
2.5", 3.5", 4.5" gauge-Zytel nylon; 6" gauge - aluminum
 

Bezel
Standard chrome plated or optional fluted black 

Lens
High impact resistant acrylic 

Socket
Brass, equipped with Sub-Z freeze proof protection 

Bourdon Tube
Phosphor bronze, filled with low temperature material 

Connections
2.5", 3.5", 4.5" gauge low back, 1/4" NPT brass male connection
6" gauge, 1/4" NPT brass low back male connection 

Case fill fluid
Interlube 

Dial
White with black markings as standard. Black dial with white markings also available. 

Temperature Compensation
Internal breathing diaphragm 

Accuracy
2.5" gauge +/- 2% mid-scale; +/-3% balance, ANSI B40.1, Grade B
3.5", 4.5" and 6" gauge +/-1% of full scale, ANSI B40.1, Grade 1A 

Mounting
Panel mount with adhesive gasket spin-on ring. Three front screws for 6" gauges 

Pressure Ranges Available
Dual scale with KPa or Bar available in limited ranges (See price list or ordering guide for common pressure ranges.)