DEN DF-EZN1G EZ Nitrogen Plastic Welder GeneratorNo More Tanks Save Money! Convert shop air into nitrogen to run at a lower cost and more convenience than refilling tanks. The DF EXN1G EZ Nitro Plastic Welder's on board nitrogen generator eliminates bulky nitrogen tanks, creating a smaller footprint. The proprietary Flow Adjust Switch Technology (FAST) System makes the DF EZN1G the easiest nitrogen welder to set up, adjust, and use.