this is what we have done. so it may not be the best but it worked for us
we cut a 12 inch piece of pvc and the made 2 cuts. It will look like you have a moon shape peice of pipe. we then tighten the moon shape piece down so it would fit in one pipe. this is where it took a little time but not bad, we then put the other half of the moon shaped pipe in the connecting pvc and pushed them together. It worked great and no gaps.
You can get a double inside connector for 4 inch pvc pipe that will line up flush with your pipe. You can just glue your pipes together, but make sure you do not place a bend where your fitting is.
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