We found a 4' piece of "C channel" aluminum at lowes, the piece is about 4 feet by 1/2 inch by 1/2 inch, just a guess). We used the eternabond tape to cloe up one end, and put that end under the drip if the A/C unit, and ran it to the edge of the roof. Then took a 2' strip of eternabond on each side of the channel, attaching it to the channel side wall and to the roof. Then took a 3.5 foot section of eternabond and went over the top of the entire thing, from roof, up the side of the channel, across the chennel opening, down the side wall of the channel, and then onto the roof. Used a ruber roller to really get it on there good and push out any air bubbles, and its been good for 2 years.
The piece is similar to this:
https://www.lowes.com/pd/Hillman-0-2...hannel/3053589
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