PEX size & fittings

Discussion in 'Big Boats' started by Boby_Hunter33, Dec 5, 2018. Add this thread to a FAQ

  1. Boby_Hunter33


    Joined Sep 24, 2016
    32 posts, 2 likes
    Hunter 33
    Ca Kingston
    Hi All,
    What is the standard used on the Hunter 45 2010 for PEX? can fittings be found at home depot?

  2. Don Lucas

    Don Lucas

    Joined Jan 12, 2011
    777 posts, 28 likes
    Hunter 410
    US full time cruiser
    I don't know. But my 410 uses 15mm fittings and I have never seen them in home depot or lowes.

    Last edited: Dec 7, 2018
  3. Jeff Jellick

    Jeff Jellick

    Joined Feb 16, 2012
    168 posts, 6 likes
    Hunter 45 CC
    US Alamitos Bay, Long Beach
    I believe it is 15mm

  4. quadrille38


    Joined Apr 11, 2010
    646 posts, 65 likes
    Hunter 38
    US Whitehall MI
    Typically 15 mm and I’ve found the metric sizes are not usually carried at hardware or home improvement stores.
    Defender carries it as I’m sure others do. Perhaps right here on SBO site.

    Some years ago I installed a water heater bypass and that came in English measurements. Defender carried the English to metric adapters I needed to make that an easy install.

  5. Terry Cox

    Terry Cox

    Joined Dec 25, 2000
    3,731 posts, 530 likes
    Hunter Passage 42
    US Shelter Bay, WA
    Hi Boby, our 1991 P42 potable water system was built with Zern Qest PEX 1/2" material. Still available online but no big box store carries the stuff. Your boat might use a different material. Other than a broken fitting, our system has held up well. A sample product here:

  6. Hello Below

    Hello Below

    Joined May 7, 2012
    588 posts, 59 likes
    Hunter e33
    CA Maple Bay, BC
    15mm either Whale or Sea Tech (Watts) will fit. You can pick them up at Marine Outfitters, 4033 Bath Rd, Kingston, ON, Canada

  7. Justin_NSA


    Joined Jul 7, 2004
    5,568 posts, 1,171 likes
    Hunter 30T
    US Cheney, KS
    I glance at the Sharkbite catalog and didn't see any metric parts. The adapters mentioned previously might be an easy way to use Sharkbites. Otherwise you may have to obtain a crimp tool.
    I love PEX. All of my home remodeling is done with it. Also nice to incorporate manifolds and valves, but be sure there's no risk of trapping water that might freeze.

  8. Scott B

    Scott B Moderator

    Joined Sep 20, 2006
    2,599 posts, 163 likes
    Hunter 33
    CA Georgian Bay, Ontario, Canada
  9. splax


    Joined Nov 12, 2012
    595 posts, 15 likes
    Hunter 34
    US Portsmouth
    I replaced that nasty soft gray Quest mess with PEX throughout my boat acouple years ago. Shark bite fittings are a great improvement over compression fittings. Home Depot carries the Shark Bite fittings and you should be able to order anything that is available through them. Don't worry too much about matching the existing size, as long as you avoid leaks.