... in model of MT2-MT7, etc.2. GTM-D adopts low temperature freeze technique to convert ... it into the low-temperature fire extinguisher.3. GTM-D does not need heating, pressuring, and has ... , accurate metering, high work efficiency, etc.4. GTM-D is the common type of CO2 filling machine ... . Good appearance, good performance, lower price.5. GTM-D is ideal filling equipment for carbon dioxide fire ...