IMHO, I refuse to buy anything from TEMU and I believe you are exposing yourself to a potentially dangerous situation. Are all of the components certified for the intended use? I have no experience refilling the smaller cylinders, and as I recall these were typically labeled "Do not refill".
I wish you good luck and I hope you have great insurance.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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