When I did the extension for my rear O2 sensor a while back, I used some plain old butt connectors, but then slapped a big old piece of glue-filled heat shrink wrap over the whole thing. When it heats up, it not only shrinks, it seals up all the connectors to be weather proof.
Also, I made sure to stagger my splices so I didn't end up with one big thick stack of connectors.
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