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Old 03-21-2020, 08:16 PM   #1
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ThruHull Exit Clamshell

My 42 has a missing clam shell on the hull where the forward sink thru hull exits. I've searched all the company's that make thru hulls. The outside diameter is 4". Anyone know where I can find one?
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Old 03-21-2020, 08:31 PM   #2
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Groco strainers

Maybe one in this flyer will work.
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File Type: pdf Groco hull strainers.pdf (485.4 KB, 63 views)
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Old 03-21-2020, 08:38 PM   #3
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No this is above the waterline and looks like clamshell.
Similar to this but covers the 4" thruhull.
https://www.thegpsstore.com/Assets/P...ages/GC850.jpg
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Old 03-21-2020, 08:55 PM   #4
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This one is plastic: https://www.westmarine.com/buy/nicro...84?recordNum=4
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Old 03-21-2020, 09:17 PM   #5
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I put a 4” S/S clamshell over a dryer vent on a previous boat so I know that they are available. But I have no idea where I got that one.
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Old 03-22-2020, 06:31 AM   #6
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https://www.discountmarinesupplies.c...yABEgKjHPD_BwE
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Old 03-22-2020, 12:23 PM   #7
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Seafit clamshell # 13528-S is 5-3/4" wide x 6-3/4" long x 2-1/4" high so maybe another option. It's 304 stainless.
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Old 03-22-2020, 01:24 PM   #8
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Personally, I would not obstruct an above waterline discharge, especially for a sink. Just make sure your hose is in good condition and is double clamped. Even if you get into some quartering waves or wind the only thing which will happen is that your sink may not drain very well until the conditions change.

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Old 03-22-2020, 02:05 PM   #9
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On some boats with thru hulls forward on the bow curve, with short hose runs and near the waterline, clamshells are necessary to keep water from entering the boat during plunging or wave slapping.
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Old 03-22-2020, 03:34 PM   #10
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Quote:
Originally Posted by Frosty View Post
Seafit clamshell # 13528-S is 5-3/4" wide x 6-3/4" long x 2-1/4" high so maybe another option. It's 304 stainless.
I was watching this thread hoping for something like this! I pulled two aft deck speakers and wanted to vent and cover the holes. Thank you
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Old 03-22-2020, 08:37 PM   #11
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AKDoug,

Another option (since unlike the OP you don't have a through hull to work around), would be something like a Vetus Typhoon or Scirocco. I'm sure they are quite a bit more expensive, but they "do more" than the clamshell.

This is a screenshot from the 2016 catalog:
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Old 03-22-2020, 09:32 PM   #12
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The speakers were mounted flush against the sides in the cockpit, and finding round vented covers for 5" holes (plus screws) seems to be impossible. Keeping them close to the side unimpeded moving around in the cockpit is the goal, the engine and Webasto heater draw air from that space so easy air draw is also a goal.

Thank you for the suggestion though :-)
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Old 03-22-2020, 11:15 PM   #13
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Beckson makes some nice plastic cowl vents including a soft one.
https://www.beckson.com/vent.html
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Old 05-25-2020, 03:06 PM   #14
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Many variations available, but I bought two originals direct from GB factory a year or so ago.
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Old 09-12-2022, 03:30 PM   #15
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Sink drain clamshells

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Many variations available, but I bought two originals direct from GB factory a year or so ago.
Any chance you could share the contact info and maybe even the GB part number for these clamshells?
Thanks!
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Old 09-12-2022, 04:18 PM   #16
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https://www.grandbanks.com/purchase/service-care/
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Old 09-22-2022, 09:56 PM   #17
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I had one missing on my GB49 in the bow area. I removed the second one and molded a new part using glass cloth and epoxy. With a little sanding and paint it look nice. The old and new parts were rebonded to the hull with 3M 4200. I took less than 2 hours to make.
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