The original scuppers are not screwed together, they are pressed together. When I took my originals off they were brittle on the outside anyway. I painted my hull so my scuppers are also painted, Awlgrip, so sun protection is fine for now. I am sure they will peel over time but these items were cheap when I purchased them. Like $10 or something at a discount place.
Here is what they look like when taken apart. They are cut to fit length.
https://www.amazon.com/Perko-0343DP-Adju...FNCN6MZD1Q
Here is what they look like when taken apart. They are cut to fit length.
https://www.amazon.com/Perko-0343DP-Adju...FNCN6MZD1Q
Tom
