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Discuss Concealed connection - tape or thread sealant in the Plumbing Forum area at

  1. Alex200274

    Alex200274 New Member


    I have a Grohe concealed shower valve I’m in installing and the casing it has 1/2 inch BSP-P female threads built into the box. Therefore I need to attach 1/2 inch BSP male to 15mm fittings to allow me to connect up the pipes.

    As I will be tiling over I wanted to ensure the best libg term water tight connection between the female to male threads - is PTFE tape ok on its own or should I use some sort of thread sealant instead - if so any advice on product. When googling I have seen quite a few US forums suggesting you need to use both, think that’s what has thrown me.

    I have currently used tape but wanted to double check before proceeding

    Any thoughts?


  2. steadyon

    steadyon Active Member

    Not sure I completely understand what connections you are trying to make, but if you are trying to seal on threads I'd use Loctite 55 only. Rough the male threads up very slightly with a file, wrap the Loctite 55 cord round in the right direction (clockwise looking at the end of the thread onto which the female fitting will screw) and tighten up. Use enough cord to give a tight fit. I'd suggest starting with about 10 wraps. You wrap it around and across the peaks of the threads.
    • Agree Agree x 1
  3. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    As above loctite 55 or 577

    Test before you fill in tho / tile
    • Agree Agree x 1
  4. Chalked

    Chalked Plumber GSR

    Whatever you use, pressure test before tiling.
    • Agree Agree x 1
    • Winner Winner x 1
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