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self-bailing deck/ scupper plumbing Question (with diagram)

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self-bailing deck/ scupper plumbing Question (with diagram)

Old 06-12-2019, 02:15 PM
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Default self-bailing deck/ scupper plumbing Question (with diagram)

I have a self-bailing deck. The plumbing from the deck to the outlet is set-up with what looks like a large dip, like a P-trap you would find in home plumbing. I modified a diagram, as seen below, to show this dip. It holds water all the time in the dip of the hose. It does also work, however. Water on the deck does make it's way out the scupper outlet. My question is: Is this bad and should I replace plumbing with a straight shot, so it will no longer hold water?


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Old 06-13-2019, 07:32 AM
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bump
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Old 06-13-2019, 07:39 AM
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has to be straight
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Old 06-13-2019, 09:18 AM
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I'd rather it be a straight-shot, so it doesn't hold water.
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Old 06-13-2019, 10:53 AM
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Its a P trap just like your kitchen sink. It is there to keep ocean gasses from entering your boat the same way the one in the sink keeps out sewer gas. Does it smell like low tide in your boat? No. That's why.
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Old 06-13-2019, 12:00 PM
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If you straighten it out you'll have waves burping and splashing through the drain and into the boat as well. It's not a flow limiter, I'd leave it.
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Old 06-13-2019, 12:08 PM
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Interesting -- I would be inclined to swap it out with a straight shot because I would assume debris will collect in the "trap" and eventually clog it, whereas a straight shot will allow anything that gets down there to simply flush out.
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Old 06-13-2019, 12:08 PM
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I agree that it is designed that way to prevent water entering when in reverse. The comment about the gasses has to be a joke however.
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Old 06-13-2019, 12:13 PM
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Originally Posted by jbros198 View Post
I agree that it is designed that way to prevent water entering when in reverse. The comment about the gasses has to be a joke however.
Not if there is a generator or exhaust near by.

Last edited by Blazer7420; 06-13-2019 at 12:26 PM.
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Old 06-13-2019, 12:18 PM
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Mine are a straight shot with ball type drains to prevent the water from flowing in backwards.
https://www.gemlux.com/89501
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Old 06-13-2019, 12:31 PM
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Water will freeze in the trap.
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Old 06-13-2019, 12:54 PM
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Mako used to use straight drains but cross port to starboard and vise versa to keep water from pumping back up the shower drains.
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Old 06-14-2019, 06:28 AM
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Mine are straight - no problems, and no worry about freeze in winter
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Old 06-14-2019, 07:18 AM
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Agree with the others. Like a straight shot. The outside scupper, mine has a rubber "flapper" on the outside that the outside water will push against and keep water from coming back in.
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