I spent about 10 minutes or so messing around in the free version of SketchUp but I was using prefab'ed straight PVC and couldn't separate the one I wanted from the other sizes to show you how they assembled. In any case, you should be able to get them to fit them together if you use the tape measure to set a guide point. Then, you should be able to drag the corresponding point on the other piece so that it lines up with the guide point and they fit. There may be a clearer method to do this but I taught myself without the videos :P. Hope this helps.
Graeme
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