Hard to tell from the pix how this would work on your boat, but the best practice is to have the hose loop above the through hull to above where the waterline is "at the greatest point of heel". Some throw an anti siphon at the top of the loop too, which to me makes sense only if you can't get the loop high enough. On my old Hatteras we had a bunch of through hulls almost right at the level waterline, and never had an issue due to the height of the loops, and no anti-siphons or check valves either. I really don't like introducing a check valve in a bilge pump system, too much crud can cause them to fail.
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George
"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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