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  1. #1

    Sink Water Lines

    What size are the copper lines connecting the sink? I am not at the boat and want to pick up a couple of valves to install on the way.
    Prometheus
    1978 53' MY Hull #529
    Viera, FL

  2. #2

    Re: Sink Water Lines

    Mine were 3/8.
    ENUFF. 1983 53MY.Hull #617 Barnegat Light Nj.

  3. #3

    Re: Sink Water Lines

    All my lines had 1/2 flare connections.
    Possible the hardest thing to work with today.

    The line is flex copper not pipe.

    Little plumbing reminder:

    You can't get a 1/2 female connector/adaptor. You may require:1/2 Female to 1/2 female adapter. With my plumbing.... a number of....

    1/2 to 1/2 female
    1/2 Male flare to Pipe
    1/2 Pipe fitting, to 3/8 compression adapter
    value / faucet

    Sure- Pipe fitting thread is the same as Flair, but it will trap water and freeze over winter!!

    If I had to do it again-
    Flex line with manifolds to shut down each run!!!!
    Would have cost the same.
    Aperture
    1977 53' MY Hull #492

    Barnegat lighthouse, LBI NJ

  4. #4

    Re: Sink Water Lines

    Phil I still have a bunch of my old flared connectors, let me know if you need anything.
    ENUFF. 1983 53MY.Hull #617 Barnegat Light Nj.

  5. #5

    Re: Sink Water Lines

    Quote Originally Posted by metama View Post

    If I had to do it again-
    Flex line with manifolds to shut down each run!!!!
    Would have cost the same.
    Something my moho manufacturer (Forest River) did very right. Should I have need to start replacing water systems, this philosophy would definitely come into play, probably with a brass manifold though.
    Attached Images
    Last edited by oscarvan; 08-04-2020 at 08:29 PM.
    1978 53' Motor Yacht "LADY KAY V"
    Hull number 524
    Chesapeake Bay

  6. #6

    Re: Sink Water Lines

    Quote Originally Posted by metama View Post
    All my lines had 1/2 flare connections.
    Possible the hardest thing to work with today.

    The line is flex copper not pipe.

    Little plumbing reminder:

    You can't get a 1/2 female connector/adaptor. You may require:1/2 Female to 1/2 female adapter. With my plumbing.... a number of....

    1/2 to 1/2 female
    1/2 Male flare to Pipe
    1/2 Pipe fitting, to 3/8 compression adapter
    value / faucet

    Sure- Pipe fitting thread is the same as Flair, but it will trap water and freeze over winter!!

    If I had to do it again-
    Flex line with manifolds to shut down each run!!!!
    Would have cost the same.
    Just to make sure I understand. The copper is too soft for a compression fitting? It must be a flare fitting? Also, how bad is the risk for threaded connectors? I don't see a lot of that when searching. Also, my boat is in Florida, but nonetheless, I don't want to set up some future northern owner with issues.

    I would like to use flare to thread, then the shut off valve, then a threaded connector to the faucet.
    Last edited by Photolomy; 08-04-2020 at 10:34 PM.
    Prometheus
    1978 53' MY Hull #529
    Viera, FL

  7. #7

    Re: Sink Water Lines

    I re-did all the fittings last year. Only did one set this year!
    So- Im leaving out the exact details that currently escape my memory.

    Flex copper tube is a different OD then standard coper pipe.
    It's like the bendable copper for a fridge, only larger.

    So it limits your options with fitting. You can't just grab a snake bite shut off.

    You are going to have one of 2 things to connect to.
    A custom made 1/2 to 1/2 flare. (Two female flair fittings on a 2 inch section of copper tube).
    Or.
    A male 1/2 flair tee.

    If you have a 1/2 flair male tee, keep yourself from just putting a non flair fitting on it. Sure you can put a normal Male pipe adapter on it.... but the flair will create stress and let water in around it.
    I let someone else fix one sink. Guess what sink I re-did this spring!

    And... they don't make a Flair to compression adapter of any kind. So your going Flair to pipe and pipe to compression.

    Pipe and Flair have the same thread angle. Compression have a different thread angle.

    You can get a 1/2 to 1/2 female pre-made fitting. So you don't need a flair tool to make them. Might not be in your hardware store but amazon has them.
    Aperture
    1977 53' MY Hull #492

    Barnegat lighthouse, LBI NJ

  8. #8

    Re: Sink Water Lines

    "I would like to use flare to thread, then the shut off valve, then a threaded connector to the faucet."

    Flare to Flare (if you don't have it all ready)
    Flare to Pipe
    Pipe to compression (drop from 1/2 to mostly likely 3/8 based on your faucet)
    Compression shut off (If you add a shutoff)
    Compression to Faucet

    Assuming you have room for a shutoff without a 90.

    I believe the standard for faucets and shutoffs are compression.
    And yes, you are trashing the compression part of the fitting. Faucets are female compression.

    Aperture
    1977 53' MY Hull #492

    Barnegat lighthouse, LBI NJ

  9. #9

    Re: Sink Water Lines

    I think you will be able to find a 3/8" flare to 3/8" compression fitting that you can attach a braided faucet connection hose onto. You can get these braided lines with attached shutoffs. The old flare nut should thread onto the new fitting even though it looks different, the thread has not changed.

    Walt Hoover

  10. #10

    Re: Sink Water Lines

    I made connections to both the master and guest head sinks using sharkbites and pex. Here is the thread showing what I did. I'm 99% sure the galley sink is the same copper tube.
    Photo Jan 04, 8 19 09 AM.jpgPhoto Jan 04, 8 18 11 AM.jpg


    https://www.samsmarine.com/forums/showthread.php?33268-Fresh-water-leak-solved



    John Novotny
    1979 53 MY "Serenity" #567
    Baltimore, MD

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