Cockpit Drains R27 OB

[Bob&Jilly]

My cockpit drains became clogged so I snaked them and ran the snake past the rubber circle on the outlet making sure not to damage it. I was wondering since the outlet is below the waterline what keeps the water from coming back in to the boat. I understand hydrostatic balance, is that enough, and there is a rubber flap at the end which does not seem very strong, so is there some kind of check valve as well?

 

[venajeff]

The interior end of the drain pipe is above water line, so water will sit in the pipe but not come in.
My problem with those flappers is that they become stiff and don't open up easy for water flow. I also had to add more sealing foam to the port, starboard, and center cockpit hatches to make them seal completely.

 

[Bob&Jilly]

The interior end of the drain pipe is above water line, so water will sit in the pipe but not come in.
My problem with those flappers is that they become stiff and don't open up easy for water flow. I also had to add more sealing foam to the port, starboard, and center cockpit hatches to make them seal completely.

Thanks

 

[Submariner]

My cockpit drains became clogged so I snaked them and ran the snake past the rubber circle on the outlet making sure not to damage it. I was wondering since the outlet is below the waterline what keeps the water from coming back in to the boat. I understand hydrostatic balance, is that enough, and there is a rubber flap at the end which does not seem very strong, so is there some kind of check valve as well?

I just blow mine out with a couple rags and the raw water washdown hose.

Scuppers

How to clean the scuppers

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