What is Reddit's opinion of Parker Hannifin 146HBLFSV-6-6 Brass Body Swivel 45 Degree Female Flare Hose Barb Fitting, 3/8" Hose Barb x 5/8"-18 Straight Thread?

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The fitting you need to go to a hose will be "barbed (size of that barb) to 5/8-18 Female fitting"

Something like this (adjust to match your barb fitting if needed)

https://www.amazon.com/Parker-Hannifin-146HBLFSV-6-6-Fitting-Straight/dp/B01BYLW740/ref=sr_1_1

Vinyl braided gas tubing (also adjust as needed)

https://www.amazon.com/Pressure-Braided-Flexible-Tubing-Reinforced/dp/B07MTYMW13/ref=pd_day0fbt_img_sccl_1/134-9900380-2236063

And some hose clamps.

But these are just for examples, I suggest you go to Lowes with your hose and that barb if you can remove it without breaking anything, and get the parts that fit. They would be in the plumbing section. Some RectorSeal for the threads couldn't hurt either, since argon is expensive.