NPT Pipe options for Rough-in shower valve


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Old 06-21-16, 09:00 AM
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NPT Pipe options for Rough-in shower valve

Apologies if this is a newb question but I'm still learning US fittings...
I have a rough-in valve from Kohler (K304) to fit.
I got the one with NPT threads to give me some options, but I'm still a bit stuck as to what to chose without having to learn to solder...

I was going to use R/A Sharkbites on there, but the pipes will need to exit parallel to the tub outlet, and with teflon tape the fitting does not to up really tight. If I tighten it harder the exit pipe comes out at a wacky angle.
Will that leak if I don't tighten it fully? I can use pipe-ope and/or tape?

What other options are there. Can you get screw on brass fittings with compression to copper?

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Old 06-21-16, 01:08 PM
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If you are doing new piping I would consider pex and use their crimping system. You already found out the $8 Sharkbite is expensive Rather than using teflon tape, consider using Rectorseal T plus 2. It is teflon based but you will have fewer leaks with it.
 
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Old 06-21-16, 03:35 PM
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Iím no expert for sure. But are you saying you are trying to do Step 4 as depicted on page 9 of the referenced document - but when you tighten the Sharkbite elbows in tight to the valve, you then canít connect the vertical copper supply pipes (as in the diagram 4 on page 9) into the Sharkbite elbows because they wonít line up?

http://www.us.kohler.com/onlinecatalog/pdf/114811_2.pdf

Did you trace the supply pipes back through the floor? There might be pipe straps or something you could remove to give you a little play in the pipes.

I cheat a little sometimes and add a little extra tape if I want something to tighten up sooner. I donít know whether the plumbers would approve of that, but Iíve done it without leaks.

(I also use the trick many plumbers use Ė pipe dope over the tape. Works for me, no drips.)
 
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Old 06-21-16, 04:04 PM
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Yes this is to get the hot and cold into the valve, so Step 9.

If I use this NPT to R/A sharkbite fitting and I tighten it up by hand fully the pipe is at a wacky angle. I did think about using lots of tape and/or dope to make it tighten "earlier".

I'm not sure if that's an approved method either!
 
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Old 06-21-16, 05:13 PM
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You don't tighten only hand tight. You must use a wrench to complete it. That may give you the angle you want. If it doesn't, then use a straight sharkbite/ipf, add a length of pipe and use a double sharkbite elbow to make it perfect.
 
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Old 06-22-16, 10:12 AM
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Why donít you just open the holes a little more where the supply pipes enter the wall to create the alignment needed?

p.s. just saw this link, and Lawrosa is a real plumber!

http://www.doityourself.com/forum/pl...-fittings.html
 

Last edited by zoesdad; 06-22-16 at 11:51 AM. Reason: added p.s.
 

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