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You could also make up some steel braided lines. They don't leak and can be disconnected/reconnected over and over.....
This is pretty basic, nothing fancy for sure. But NEVER leaked!
Hmmm (embarassed) ... dont know , been a few years.. But will say no teflon tape or anything else...
Regular steel line flares are 45 degrees, AN stuff (stainless braid, anodized fittings etc.) going to other AN stuff can be 45 or 37 degrees. Depends on what you buy.