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2-1/2" Class1 Liquid Filled Gauge

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2.5" Class1 Liquid Filled Gauge

Class1 is a leading manufacturer of gauges that exceed the rigorous demands of fire service professionals.

The Class1 2.5" Interlube Filled Pressure Gauges with patented Sub-Z II freeze-proof isolator are a must for all fire apparatus. Because the stem and bourdon tube are filled and sealed with a low temperature liquid, water cannot enter the tube. This prevents freezing and subsequent damage to the gauge.

The fill fluid in the case dampens pulsations and vibration while eliminating the need for snubber valves. In addition, Interlube fill eliminates fogged lenses, rust and corrosion.

The demands of fire fighting professionals for accurate and reliable instrument readings have been met by thousands of Class1 freeze proof pressure gauges that are now in service and meet or exceed NFPA and ANSI standards.


Case:   2.5" gauge - Zytel nylon
Bezel:   Standard chrome plated or optional colors (2.5" only)
Lens:   High impact resistant acrylic
Socket:   Brass, equipped with Sub-Z freeze proof protection
Bourdon Tube:   Phosphor bronze, filled with low temperature liquid
Connections:   1/4" NPT brass male connection
Case Fill Fluid:   Interlube
Dial:   White with black markings as standard
Temperature Compensation:   Internal breathing diaphragm
Accuracy:   2.5" gauge +/- 2% mid-scale; +/-3% balance, ANSI B40.1, Grade B
Mounting:   Panel mount with adhesive gasket and spin-on ring
Pressure Ranges Available:   Dual scale with KP or Bar available in limited ranges

Lighted Pressure Gauges:
The Class 1 series of liquid filled backlit pressure gauges use LEDs to light the liquid-filled gauges. The gauge case has been upgraded to isolate the LED light from the gauge. LED lights are independent of the gauge allowing for interchangeability color selection and easy field replacement.

2.5" Colored Bezels:
Class1 colored bezels are made of stainless steel with DuPont AlestaTM powder coating. This coating provides superior durability and corrosion protection. Colored bezels are available in 12 colors on our premium 2.5" gauges. Not installed, ordered separately.

Gauge Body Design:
The Class1 innovative body design for fire service gauges will make installation a simple operation. This case utilizes a unique spin-on ring to clamp the gauge into the pump panel.

The Class1 body design will also work if you need to replace an existing Class1 gauge. The hole cut outs are the standard Class1 sizes.

  • Class 1...

    Posted by Jamie Truett on Feb 19th 2024

    Quality products, Fast shipping, competitive pricing.

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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