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Blue low side gauge 2 1/2 inch diameter 1/8 inch connection

JB Industries

JB Industries M2-250 Low Side Gauge 2 1/2 in

SKU CH-1851-04KD1

Low-side pressure gauge with a 2 1/2 inch dial and 1/8 inch connection for refrigerant system diagnostics

  • Product weight0.39
  • Product typeClosed Base
  • Main materialHAWA
  • Low-side pressure reading with 2 1/2 in dial
  • Blue colour coding for quick refrigerant identification
  • 1/8 in connection fits standard service ports
  • Closed-base construction protects internal mechanism
  • Lightweight at .39 lb for easy handling

Low-Side Gauge for HVAC Service

The JB Industries M2-250 is a low-side pressure gauge built for refrigeration and air-conditioning technicians. Its 2 1/2 inch dial provides clear readings during system charging, evacuation and diagnostics. The blue colour coding identifies the low-pressure side at a glance.

Closed-Base Construction Under Pressure

A closed-base design seals the Bourdon tube assembly from the mounting surface, reducing leak paths when the gauge sees sustained system pressure. The HAWA material resists corrosion from common refrigerants and oils encountered during long service sessions. Threaded 1/8 inch connections maintain a tight seal through repeated hook-up cycles.

Practical Limits of 1/8 Inch Flare Fittings

The 1/8 inch flare connection suits standard manifold hoses and service valves found on most residential and light-commercial equipment. Larger industrial systems often require 1/4 inch or metric ports, so this gauge will not fit those without adapters. Maximum working pressure is defined by the gauge range printed on the dial face.

How it compares

Measured against everything we stock in Fan Motors, Parts & Clip-On Fans, at today’s prices. Recalculated every night.

Price $16.99
Cheaper than about 73% of the 473 comparable items (median $38.99).

Specifications

Product
Brand nameJB INDUSTRIES
Product typeClosed Base
Size & build
Main materialHAWA

Questions about this item

How much power does the JB Industries M2-250 draw when mounted on a manifold all day?

The gauge is a mechanical instrument with no electrical components, so it draws zero power and generates no heat during continuous use.

What connection fitting must the buyer already have to install this 1/8 in gauge?

A manifold block or hose with a matching 1/8 in NPT port is required to thread the gauge into the system.

Will the blue low-side gauge face remain readable on an older manifold set?

The 2 1/2 in dial uses standard refrigerant colour coding, so it matches the scale layout found on legacy manifold bodies.

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