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I'm going to be running some supply lines to an outdoor wash-up sink from my house. I'd like to leave the house at the sill box with something rigid (prob copper), elbow downward into the ground, and transition to PEX once in the ground. The exposed portion would look something like the copper in this pic: https://i.stack.imgur.com/x1b0a.png.

I live in an area where it gets well below freezing in the winter, and the ground does indeed heave. Does anyone have any recommended solutions to protect against that? Googling has failed me. I was thinking maybe flexible water heater connectors but that seems like a hack. I'm aware of the bellows/corrugated-like couplings on bigger industrial piping systems but haven't seen anything similar for smaller pipe sizes (3/4 - 1").

Thanks.
 

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Naildriver
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You'll need to figure out a way to drain it in the winter. An interior shut off valve with a means of putting air pressure on the pipe to evacuate all the water will be needed.
 
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