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  1. #1
    Join Date
    Aug 2006
    Posts
    2,607

    PVC Thread Sealant Needed

    Our Plumber quit, so I got this. In a lab they have a Blue Catch basin under the sink, in case something goes down the drain that wasn't supposed too. There is a Blue Nylon, 2" FPT fitting welded to the Basin. Threaded into that is a Blue PVC nipple. I can't stop it from leaking with Teflon tape. What plastic safe Sealant can I use, on what probably is a stretched Nylon fitting?

  2. #2
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    2,416
    Any thing with teflon in it, or maybe even a combination of tape and pipe dope with teflon. Seems to me most PTCs say right on the can if it can be used on PVC or not. Are you sure you don't have a crack, it's hard to beleive that even with no sealent on it it wouldn't leak since there is no actual pressure on it.

    Just had another thought, do you have any silicone caulk handy. I have used that on threads before, they can be a little harder to break loose later but it's worth a try if the other doesn't work.

  3. #3
    Join Date
    Sep 2009
    Location
    Stumptown,USA
    Posts
    1,253
    Rectorseal T-2 or Tru-Blue. I never have good luck with teflon tape.
    Challenge yourself, take the CM test --- Certificate Member since 2004 ---Join RSES ---the HVAC/R training authority ---www.rses.org

  4. #4
    Join Date
    Feb 2010
    Location
    Cal
    Posts
    1,596
    I like the silicone method as per kls. Thick and good sealing properties but low strength so it can be dismantled.

    Female plastic fitting stink. They either stretch or crack.

  5. #5
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    are you using the yellow or red teflon tape

    they're both thicker than white
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  6. #6
    Join Date
    May 2010
    Posts
    1,295
    Plumbers putty

  7. #7
    Join Date
    Jun 2004
    Location
    Location:Raleigh NC
    Posts
    9,657
    I've had good luck on PVC with silicon or Yellow Teflon
    If you help others then you are a Success

  8. #8
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,867

  9. #9
    Join Date
    Aug 2006
    Posts
    2,607
    What I really need to do is use a Hot Glue gun and Hair Dryer on it. I'm sure the lab people are twisting the fitting everytime they work the union, that's on the other end of the nipple. There's a lever to open the drain, that's on the other side of the Basin. It can have three feet of water on the fitting, before the sink over flows.

  10. #10
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,854
    Permatex non-hardening sealant.
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  11. #11
    Join Date
    Dec 2001
    Location
    Ocean Pines, MD
    Posts
    7,011
    Just glue it with PVC cement on it like one of my competitors did on a 52 Unit building's air handlers. Glues the threaded fitting right to the drain pans. Unreal.

  12. #12
    Join Date
    Sep 2008
    Posts
    586
    I've done up to 2" with real tuff a teflon based thread sealant but I'd expect any pipe dope to work.

  13. #13
    Join Date
    Aug 2006
    Posts
    2,607
    Just a little update. The 2" Nylon fitting that's welded to the plastic catch basin is not tapered. Also the lab workers aren't using the back-up wrench, that we supplied, on the Union nipple. Thirdly they are using the nipples as handles when they pull the basin to clean it.

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