Cockpit Drainage


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6 Responses to Cockpit Drainage

  1. Interesting thoughts on the placement of the drains. I am in the same situation with my B24 in that I would like to add aft cockpit drains but just don’t know where to place the through hulls. I did come across another site where he had installed large 2″ drains on the walls of the cockpit for quick drainage if he were pooped. His overboard drains were led above the water line (I think his boat had a little more free board than the Bristol’s), but he addressed the back flow issue with pvc check valves used for residential plumbing applications. You can get them from 1-1/4 to 2″. Something to think about. I’ll have to keep checking back and see if you have come up a solution to the common problem.

    Submitted by: Brian Sikkema on January 28, 2011 at 7:38 pm

  2. Hi Brian,

    Great information on the cockpits. They are definitely on my mind again these days. At this time, I am planning to try to run the drains out of the transom. However, the cockpit sole isn’t much higher than water-level so it’s a design challenge. No doubt I’ll be posting more information on this project as I move forward.

    Thanks for the comment and check back!

    Submitted by: Andrew Van Dyk on January 28, 2011 at 7:42 pm

  3. Andrew: Your notes on the ‘original’ set up are correct. I have that on my 1966. I ‘ve had NO issues with drainage or problems with the underwater through hulls in 32 years. The boat has a manual bilge pump with a 1.5in. outflow T-d into the port line. THAT was an ‘issue’ due to every time you pumped the water would come UP the pipe and soak your shorts!! I installed a house sump backflow preventer – UPSIDEDOWN so water goes DOWN and out of the boat but not UP onto crew. I have also installed an electric into the port line T-d with a like preventer. Works GREAT! I keep wood bungs incase of problems but so far all has been well.
    Let me know and I’ll try to get to the boat and get pics. We’re in winter storage now.
    Blessings, Dean

    Submitted by: Dean Aschenbrenner on November 10, 2011 at 1:47 pm

  4. Hi there,

    You are thinking along the same lines as I am. I am refitting a Cal34.

    I will add a large, and I mean large cockpit drain to drain water out the rear of the cockpit. My idea is to use a large fiberglass tube between the rear cockpit surface and the transom. My local chandlery has them in all sizes: 4 inches, 5 inches, 8 inches, you get the idea. Each diameter has a similar sized end cap with a rubber flap attached (usually for exaust of large boats/ships) to stop back flow of water in a seaway. I will glass it in and not only will it be simple, it will also be bombproof and will never need another look.


    Submitted by: Brig Cooley on December 20, 2011 at 8:37 pm

  5. Hello Brig,

    Thanks for your comments and I really like the tube idea you’ve mentioned and this was my initial thought as well.

    As I progressed with piecing the drains together, however, I found that I didn’t have the room for a tube in my lazarette as it interfered with some stowage plans I had. There is also a very specific slope I needed to match from the cockpit sole out the transom and I felt could best match this by building drain channels with my old standby – fiberglassed marine ply. The drains will each have a small hatch to access inside of them every 10 years or so when new paint needs to be applied. I will also plan to add a rubber flap as you mentioned.

    I’m still working on the drain channels (worked on the access hatch flanges last night), though in the end, a better use of my time may have been best to make use the pre-fabricated tubes you mentioned, but now that the work is mostly done I’d say either option works. I hope to complete this project in the next couple of weeks, so check back before long to see photos and descriptions of how it all came together.

    Thanks for your comment,

    Submitted by: Andrew on December 21, 2011 at 4:36 pm

  6. I’ve removed the old project logs that cover only a small amount of the final cockpit drainage and didn’t do a good job summing up the cockpit drainage as it exists today.

    Believe it or not, I am back researching the boat and trying to gather steam toward starting construction again this summer.

    Submitted by: Andrew on February 1, 2017 at 6:14 pm


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