I'm sure the portable isn't enough and I doubt the 5 will be enough to run your torch really well. Oxygen is important for a hot flame and clean bright colors. It also depends if you're using boro or soft glass. You need much more oxygen for boro. Basically the more oxygen available to you the better.
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Polly
"Confidence, like art, never comes from having all the answers; it comes from being open to all the questions."
-Earl Gray Stevens-
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