I used an expandable PVC coupler. It expands from about 1" to about 4"
long.

It was perfect for my application and hasn't leaked so far-been in about 3
months.. Kept me from digging up and replacing some PVC.

Got it at local hardware store (Ace).
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We're opening a water line closed in winters to avoid freezing splits.
Just found a spot at the end of a long run that has split.Our son told
us about it but neither of us has seen how the crack goes. Is there
an adhesive that can be applied to soak into the split and seal it?