Are these for direct burial? Even in salty air theses do great.
http://www.kinginnovation.com/pro-dryconn.html Although I'm not fond of the comparitively weak plastic cap for the nut - as it is essentiallty just a container of silicone with a spring connector in it, and if a brute like me, they can crush in your hand... But they do work well for the purpose. For the longest time they were the only patent holders for this type of application. Now a few others are making them too. Havent use these yet though...
http://www.idealindustries.com/wt/TwistOnWireConnectors.nsf
