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Thread: Pontoon drain fittings

  1. #1
    Join Date
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    Default Pontoon drain fittings

    I'd like to install drain fittings on my logs. I have someone who has a portable welder (it's a big PIA to haul my boat through city streets), but where can I find the fittings (both male & female)? I'm thinking I should use a different metal for the plug, such as brass. Any ideas?
    1994 Tracker Party Cruiser
    115 hp Merc, 2 stroke

  2. #2
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    Go o jegs.com type in Moroso aluminum weld on bungs 3/8 npt female

    If you cant find it I'll post the link a little later.
    2006 Forester 19 Fish (new deck and carpet, Pontoonstuff interior, 2019)
    1996 Mercury 50 ELPT4S
    1983 Sea Nymph FM171 Striper (complete rebuild from hull up, 2014)
    1985 Johnson 70 J70ELCO

    Raystown Country, PA

  3. #3
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    https://www.jegs.com/i/Moroso/710/68...YaAkXjEALw_wcB

    They have bigger, these or 1/2 npt is what I've seen used.

    I would use a disimilar plug too, these take NPT pipe plugs that you can get at any hardware store, I would use brass or stainless.
    Last edited by Moser; 03-13-2020 at 10:17 PM.
    2006 Forester 19 Fish (new deck and carpet, Pontoonstuff interior, 2019)
    1996 Mercury 50 ELPT4S
    1983 Sea Nymph FM171 Striper (complete rebuild from hull up, 2014)
    1985 Johnson 70 J70ELCO

    Raystown Country, PA

  4. #4
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    Edwardsville, IL
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    Thanks, I had no idea where to find such fittings. I figure 3/8" should be sufficient. I don't want to use a ferrous bull plug (even coated) to ensure it doesn't corrode. I was hesitant to use AL as dissimilar metals tend to "become one" with each other, but I figure the threads will be protected by teflon tape so that shouldn't be a problem.

    I appreciate your help Moser, thank you again.
    1994 Tracker Party Cruiser
    115 hp Merc, 2 stroke

  5. #5
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    2006 Forester 19 Fish (new deck and carpet, Pontoonstuff interior, 2019)
    1996 Mercury 50 ELPT4S
    1983 Sea Nymph FM171 Striper (complete rebuild from hull up, 2014)
    1985 Johnson 70 J70ELCO

    Raystown Country, PA

  6. #6
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    You're welcome, Sir.

    Sometimes it's just a matter of knowing what they call the thing. Where I worked we made a stainless and regular steel "half coupling" that looked just like that, and was welded in to provide a drain in tanks, pipes, other applications in oil, gas and chemical industries. If you search for an aluminum half coupling you'll get nothing, go figure.
    2006 Forester 19 Fish (new deck and carpet, Pontoonstuff interior, 2019)
    1996 Mercury 50 ELPT4S
    1983 Sea Nymph FM171 Striper (complete rebuild from hull up, 2014)
    1985 Johnson 70 J70ELCO

    Raystown Country, PA

  7. #7
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    Larry
    Great info, nice job.
    Mal
    Malcolm ( Goofy )
    TAP Fins
    8525 Sylvan
    200 H O E Tec




    " Keep a fire in your heart and a smile on your face, for you never know when your leaving this place"

  8. #8
    Join Date
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    Central Texas
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    Quote Originally Posted by belercous View Post
    Thanks, I had no idea where to find such fittings. I figure 3/8" should be sufficient. I don't want to use a ferrous bull plug (even coated) to ensure it doesn't corrode. I was hesitant to use AL as dissimilar metals tend to "become one" with each other, but I figure the threads will be protected by teflon tape so that shouldn't be a problem.

    I appreciate your help Moser, thank you again.
    Using a brass plug is fine, but stainless will set up electrolytic corrosion with aluminum.... regardless of Teflon tape. The tape will be shred and metal to metal contact will still occur... it is not an insulator.... it is only a leak deterrent. Hope this helps.
    2015 SouthBay 522FCR w/150 Yamaha

  9. #9
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    I have nylon plugs in mine, they won't corrode, but the sun will kill them. They are 14 years old and never been out, I don't think I'll mess with them.
    2006 Forester 19 Fish (new deck and carpet, Pontoonstuff interior, 2019)
    1996 Mercury 50 ELPT4S
    1983 Sea Nymph FM171 Striper (complete rebuild from hull up, 2014)
    1985 Johnson 70 J70ELCO

    Raystown Country, PA

  10. #10
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    Edwardsville, IL
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    I'm hoping to get my boat out of the water soon, which is when I'll have the AL fittings welded in. My plugs are SS & I'm gonna wrap the threads with Teflon tape, but I take my boat out of the water at least once a year & I plan to remove the plugs each time to check for leaks. I'll catch any electrolytic/dissimilar metal corrosion before it gets very far. Brass plugs would be better, so I'll look for a couple of those & have them ready for next year.

    My boat stays in the water year round & regularly goes through hard freezes so a nylon plug wouldn't work for me. Besides, I'm gonna remove the plugs on my yearly inspection. I'm an old aircraft mechanic & am used to giving a thorough inspection to devices I trust my life to & that's transferred over to my boat. I service my batteries & engines (onboard generator, separate system) & catch things before they fail. I Inspect everything, which is why I used SS screws to attach my underskinning. (I always find a few loose ones on the edges, mostly at the rear of the boat due to engine torque)
    1994 Tracker Party Cruiser
    115 hp Merc, 2 stroke

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