Found Leak! Now how to fix?

Hello all!

I have found the leak finally. I was loosing about 4 inches in 5 days! This is a in-gound plaster pool. The leak is a broken/cracked pipe between the auto-fill barrel and the pool (not under pressure). This is a 3/4" PVC pipe that is flush with the plaster and goes 18" into the auto-fill barrel and has a threaded 3/4" female connector that is flush with the barrel.

How do I fix this pipe?

Thanks for your help in advance!