21812 - 1.5-inch Acetylene Cylinder Gauge 400 PSI Back Mount

High-Visibility 0-400 PSI Gauge for Acetylene Service

The ESAB 21812 is a precision-engineered replacement pressure gauge designed to restore functionality to your gas delivery systems. With a 1.50-inch dial diameter, this compact gauge is perfectly sized for light-duty and medium-duty regulators where space is at a premium but readability cannot be compromised. The scale is calibrated from 0 to 400 PSI (pounds per square inch), making it the ideal specification for reading high-pressure supply inputs on Acetylene regulators. Since Acetylene is stored dissolved in acetone at pressures generally below 300 PSI, this 400 PSI scale provides the perfect resolution for tracking gas consumption from full to empty.

Durable Construction
Unlike fragile metal cases that can dent or rust, the ESAB 21812 features a case made from high-quality ABS plastic. This material offers superior resilience against the knocks and bumps typical of welding carts and portable setups. The lens is designed to remain clear, protecting the needle and dial face from dust, sparks, and oily residues found in welding shops. The internal mechanism is built to withstand the vibrations and pressure fluctuations inherent in gas cylinder usage, ensuring consistent and repeatable readings.

Seamless Integration
The unit features a Lower Back Mount (LBM) connection, which is the standard orientation for most regulator bodies, allowing the gauge to sit flush and face the user. The "Red" attribute signifies its application suitability for fuel gas lines, aiding in quick system identification and safety compliance. When a regulator gauge fails—whether due to a dropped regulator or internal fatigue—it creates a safety hazard and operational blindness. Replacing it with a genuine or high-quality equivalent like the ESAB 21812 ensures you can trust your equipment's feedback again. This gauge is an essential spare part for MRO (Maintenance, Repair, and Operations) inventories in fabrication shops, automotive garages, and industrial maintenance departments.