Your supply house has kits for that. Basicly a crimp sleeve connector with a piece of heavy heat shrink for each conductor. It may require you to buy an MD6 to crimp it, if you don't already own one.
You can get underground splice kits that size at any of your big box stores. You can also get them with an allen head set screw so you don't need a crimper.
Installed hundreds over the years, never had one fail. Maybe you should hire hire someone a little stronger that can tighten them for you:laughing:
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