How long is this line? It's currently in 2 pieces now? Why not cut shrink tube to the length of the hose (just the hose, not the ends), install the hose, install the shrink tube on the hose and shrink it in place. It will add almost no thickness to the hose, it will cover end to end and not look funny, and it won't leak. You could even smear some sillycone on the ends of the tube before you shrink it down to assure it won't leak after install.
Bill
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