I haven't bought the hose barb yet. Should I buy a smaller one? maybe 1/4"?

@jrrdw Braided hose seems to be stainless steel. I need something simpler.
@jimmy101 I need the hose to withstand 300 PSI. I have turned over the entire store but there are no pressure hoses. Does the fuel line you mentioned fits on a hose barb?
I'm looking for something that will fit on this:
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Hi there,
I need a basic pressure hose for a project I'm making (the one that you use hose clamps to tighten it on the hose barb).
I live in an area where pneumatics are very scarce so I thought to buy one from Ebay.
Trouble is, when i search "Pressure Hose", "Pressure Tubing" and such, the results ...