Sea water in sink at speed

[OLD BAY]

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.

 

[F/V First Team]

solenoid operated seacock
easy with the flip of a switch

 

[OLD BAY]

solenoid operated seacock
easy with the flip of a switch

Do they make those? If so I'm going to try that! I could hook it up to the engine ignition so when the engine runs the seacock is closed.

 

[WoundUpMarine]

what about just putting a check valve inline?

 

[F/V First Team]

Might not have enough pressure in the sink line to open up the valve when you want to evacuate the bowl.

I will look for a solenoid example when I get home.

 

[OLD BAY]

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]

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]

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.

 

[jerseysportfisher]

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 ?

 

[Alison Tuna]

We have the solenoid operated valve. Works perfect for when we open the shit tank to unload.

 

[F/V First Team]

Do you know which model?

 

[OLD BAY]

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.

 

[F/V First Team]

Rule 301 clear elastometric sealant

 

[Blitzen]

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.

 

[Magician]

Can you just put a valve in the drain line under the sink where you can readily reach it??

 

[OLD BAY]

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.

 

[Tuckerman]

How about a plug in the drain like an old school bath tub?

 

[cb34]

check valve

Check valve under sink always did the job.