Mabye the biggest advantage of these is that they are a neat way to cover the ragged ends of braided hose. I have used and seen a lot of them (or similar ones) on race cars where flexible hoses have to be the braided type. The ones I used were Aeroquip brand, but same principle.
They are reusable and probably don't even need the spanner wrenches for the pressures of a W/C system (finger tight should do).
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Jack of all Trades, Master of None.
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