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. . . I can't imagine scuppers that run through the bottom work all that well either. Eric
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That's because your missing one small but important detail. There are small wedges attached to the hull just in front of the scupper tubes which create SIGNIFICANT suction. It pulls the water out much faster than just depending on gravity!
I think I had temporarily removed them for better access when flaring the end of tube, so that's why you didn't see them in photos in my old post.
Also, you don't necessarily have to buy an expensive flaring tool. I used some threaded rod, nuts & washers and some tapered sockets I had to get the flare started, then finished with ball peen hammer. Maybe not as pretty as using a tool, but it worked! One problem with those plastic tubes is that they will eventually crack if enough UV gets to them.