Yellow Jacket 78057 Low-pressure Diaphragm Gauge 0-10 in Wc

Product Description

The YELLOW JACKET 78057 is a low-pressure diaphragm gauge built for measuring gas pressure in low-pressure HVAC and combustion applications. It features a bronze diaphragm that provides added protection against incidental overpressure events, making it more durable in field conditions where pressure spikes can occur. The gauge reads in inches of water column (in WC) and ounces per square inch (oz/in2), covering a range of 0 to 10 in WC. The 2-1/2 inch dial face provides a clear, readable scale. A 1/4 inch NPT male fitting allows for direct connection to standard test ports and manifolds. HVAC technicians and gas service professionals use this gauge for combustion air, gas pressure testing, and draft measurement work.

This gauge is suited for residential and light commercial HVAC service, particularly gas furnace commissioning, heat exchanger testing, and appliance gas pressure verification. It is a handheld or panel-compatible instrument appropriate for technicians performing low-pressure diagnostics where accurate in WC readings are required. The blue color coding helps distinguish it from higher-pressure gauges in a multi-gauge setup.

Key Features

• Bronze diaphragm construction for protection against incidental overpressure
• Dual-scale readout in inches of water column and oz/in2
• Measurement range of 0 to 10 in WC
• 2-1/2 inch dial face for clear field readability
• 1/4 inch NPT male fitting for standard test port connection
• Blue color coding for quick gauge identification

Compatibility

Designed as an OEM-style low-pressure diaphragm gauge for use in residential and light commercial HVAC and gas appliance service applications requiring measurements in the 0 to 10 in WC range.

Installation Notes

Installation and use should be performed by a licensed HVAC technician or qualified gas service professional. Always shut off gas supply and relieve system pressure before connecting or disconnecting the gauge from any test port. Verify the 1/4 inch NPT male fitting is properly threaded and sealed before taking readings. This gauge is rated for low-pressure service only and must not be used on high-pressure gas lines or refrigerant systems.

Technical Specifications

• Pressure Range: 0 to 10 in WC
• Scale Units: in WC and oz/in2
• Dial Diameter: 2-1/2 inches
• Fitting: 1/4 inch NPT Male
• Diaphragm Material: Bronze
• Color: Blue

Standard Information

• Brand: YELLOW JACKET
• Manufacturer Part Number: 78057