Our Fill Gun is the ultimate assembly tool for filling bulk CO2. The complete assembly includes a Fill Wrench, 0-600 psi Glycerin Filled Gauge & Protector, Standard Blow Down Muffler, and 450 psi Pressure Relief Valve. With these top-of-the-line components, you can be sure that your CO2 filling process is safe and efficient. The Fill Gun is an essential tool for any Liquid CO2 distribution operation and will quickly become your go-to for filling tasks.