You mean the channel above the slide? (on the side of the unit). If so, I've never seen an extension for it. But then again, I haven't really looked. I have that drip channel on mine as well. As far as I know, they're just to divert the water from the roof edge drip to the sides of the slide. I guess to keep water from dripping down from the roof to the rubber seals and possibly entering the coach. Again..never have seen anything to extend them.
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