Sea water in sink at speed

OLD BAY

Admiral
Joined
Aug 25, 2012
Posts
1,109
Likes
832
Location
Annapolis, Md
First Name
Eric
Boat Make
Shelter Island 38
Any easy fixes for sea water backing up into the sink while at speed? I close the seacock for now, but it's a PITA to reach and open up to use the sink. The through hull is located just about at the max beam, is flush mounted and is underwater of course.

I wondered if I could use an adhesive alone to build up a small ridge on the outside front half of the through hull to deflect the water away?? Kind of like a tiny deflector.
 

OLD BAY

Admiral
Joined
Aug 25, 2012
Posts
1,109
Likes
832
Location
Annapolis, Md
First Name
Eric
Boat Make
Shelter Island 38
what about just putting a check valve inline?

I tried that, but for some reason (the pressure is so low?) that the check valve doesn't close and the water still backs up.

I found some RV 12 normally open check valves! I might use this above the waterline and keep the original through hull seacock for safety.

I love this idea, thanks.
 

F/V First Team

Admiral
Joined
Jan 10, 2012
Posts
6,146
Likes
2,490
Location
Narnia
Website
www.otisenterprisesmarine.com
Boat Make
Northern Bay 36 - Modified
Don't mention it. You might luck out and be able to swap the internals around so it would be normally closed, that way if you lose power that avenue would be shut for water ingress.
 

Blitzen

Admiral
Joined
Sep 1, 2011
Posts
5,832
Likes
6,531
Location
Sumday Isle, RI
Boat Make
Flowers Boat Works 46 hull #1, Flowers Boat Works 36 hull #1, Wayne Beal 28 Hull #1, Repco 30 1968,
Cut a piece of PVC pipe on an angle and along the length, large enough to cover the thru-hull on the outside of the hull, paint it the same color and bond it just forward and facing aft over the port. When the water rushes past the thru-hull it will deflect any water and also create a vacuum in the line. Done no wires, no fuss and no clogs.
 
Joined
Feb 13, 2012
Posts
1,181
Likes
149
Location
Communist part of NJ
Boat Make
Bertram 33SF
Cut a piece of PVC pipe on an angle and along the length, large enough to cover the thru-hull on the outside of the hull, paint it the same color and bond it just forward and facing aft over the port. When the water rushes past the thru-hull it will deflect any water and also create a vacuum in the line. Done no wires, no fuss and no clogs.


can't you do that by reversing a clamshell intake ?

boat-stainless-steel-clamshell-vent-22400-325509.jpg
 

OLD BAY

Admiral
Joined
Aug 25, 2012
Posts
1,109
Likes
832
Location
Annapolis, Md
First Name
Eric
Boat Make
Shelter Island 38
Thanks guys,

I might try Blitzen's PVC idea, since I have a ton of PVC and the boat's on a lift. Any suggestions on a way to bond it to the hull? 5200? Something less permanent? I was hoping to avoid screwing into the hull.
 

Blitzen

Admiral
Joined
Sep 1, 2011
Posts
5,832
Likes
6,531
Location
Sumday Isle, RI
Boat Make
Flowers Boat Works 46 hull #1, Flowers Boat Works 36 hull #1, Wayne Beal 28 Hull #1, Repco 30 1968,
Old Bay,
You will need something strong to bond the PVC, I have had good luck with FlexBond 5000, which you can get at West Marine, just ask for it at the counter. It will set up faster than 5200. A small clean bead on the edge of the pvc is all you need. If you want to get it off just slice it off with a length of mono line between two handles, or a hot knife.
You could also just try some boatlife as a test which might work just fine.
 

OLD BAY

Admiral
Joined
Aug 25, 2012
Posts
1,109
Likes
832
Location
Annapolis, Md
First Name
Eric
Boat Make
Shelter Island 38
This site is fabulous, thanks A/V First Team and Blitzen.

Magician, I actually have easy access to the valve, but I'm soooo lazy (and occasionally forget to open it before others use the sink!) that I'm looking for a solution that requires no action on my end to work.
 

cb34

Admiral
Joined
Oct 31, 2011
Posts
2,220
Likes
1,060
check valve

Check valve under sink always did the job.
 


Top Bottom