wrote

I would not use SharkBites underground. As the earth applies pressure
to them, especially if the ground freezes, they could become detached.

On a job, I encountered a SharkBites come detached inside a wall because
it fed the shower head and was resting exactly right against a piece of
wall bracing. The people who lived there probably pulled down on the
shower head, and it came undone inside the wall. Personally, I dont
think much of them, and wont use them in my home.

A compression fitting is probably a good solution, although I've not
used them on plastic pipes except plastic supply tubes under sinks.

Definitely not suggesting Shark Bites for underground. Just making the
comment that you CAN buy a very easy fix for problems these days if you know
what to look for.

Steve