Grohe Euphoria Leak

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Salguod

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I'm installing a Grohe Euphoria 360 Shower system in my new shower. I've plumbed in the wall 1/2" PEX to a brass Sharkbite 1/2 female NPT drop ear elbow.

The Grohe system has the mixing valve outside the wall. It uses a European straight thread and comes with "easy install adapters" with male NPT at one end and female straight thread at the other to convert. You attach them to the NPT with Teflon tape, as any other NPT. Then you attach "S unions" to the straight thread using sealing cord. The process is fairly well shown in this video, starting around 2:35, the sealing cord is around 4:30:


I'm using the S Union that comes with the valve (shown first in the video), not the ones with service stops the video uses. So I didn't need to do the scoring, the parts were already scored. I wrapped the thread just like he showed but I'm getting a slow drop leak from the straight thread.

A few questions:

1 - Anyone have experience with these straight thread connections and know any tricks to getting them to seal?

2 - I'm going to need to pull this apart and try again, where do I get that sealing cord?

Thanks
 

Salguod

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Well, I got it sealed. For those who find their way here searching for help like me, here's what I found. Loctite 55 is the sealing cord you need. Check out the data sheet for installation instructions, but these items seem key:

1 - Wrap around the fitting the recommended number of times for your pipe size as shown on the data sheet. Not too many, not too few.

2 - Keep the cord primarily in the thread "valleys" not on the "peaks". You don't need to chase the thread or completely avoid the thread tops, but fill the threads.

3 - Keep and adjustments to the positioning of the S unions to less than 45 degrees for final positioning.

I think I didn't pay attention to #2 & #3 well enough. Getting the offset S unions level and the right distance apart was a bit tricky, so I ended up doing quite a bit of rotating the S unions the first time. The second time I dry fit first without sealing cord so I new about where they needed to be. Then I positioned the one directly and only had to adjust the other 10-15 degrees after.

It's not together and sealed.
 
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