Leaking gutter down pipe/elbow junction

Question

I noticed a leak at the joint  of  a down pipe and An-elbow, yet rain water flows through the down pipe as expected but quite a large amount of water is dripping (I outlined with red on the photo).
There is an incline (so that water flows down), no holes in pipes. I tightened the connection but still for whatever reason it drips.
I looks to me that rain water traps in between the sloped pipe and the elbow and starts dripping to get its way out.
Any suggestions on what else I can improve to fix this?

Jamie M · Answer

When mine leaked from a similar location, it was from the screw. Typically, they use self-tapping screws to hold the pieces together. Since this is just thin aluminum, the interior piece gets pushed up as the screw taps through, and/or it leaves a jagged piece so water can get out.
All I did to fix it was to smear the bottom surface of the upper pipe with a generous glob of silicone caulk, slide it in, and replace the screw again.

Leaking gutter down pipe/elbow junction

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