I use a bit of leak test solution to lube the barbs before I put the hoses on so that I can twist the hose all the way up against the back of the b-fitting nut.
Then test all your connections with the leak test solution - you'll have quite a few connections you'll want to make sure they're all nice and tight. It's good to check them periodically thereafter.
Leak test solution can be found at the big box stores or welding supply houses - make sure it states it's safe for oxy use (no petroleum products)
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