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I've attached two links to the fittings I'm looking to purchase online. But I don't know if they will work together.

Chrome Plated Brass Pipe Fitting, Coupling , 1/2" NPT Female

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Moen 116651 6-Inch Straight Shower Arm, Chrome

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The following table describe various thread standards: onestopfire.com/threads.htm – user4991 Jan 20 '12 at 20:31
If you can use a smaller pipe, something like this should work, amazon.com/gp/product/B0046A8F84/… although that doesnt answer your question. – fubarcrew Jan 20 '12 at 21:18
You would need to go to a nut and bolt shop for this one.. threads are a pain in the wrist. – ppumkin Jan 21 '12 at 11:17
@fubacrew I think finding a different pipe is the way to go. The one you link to looks promising. – Brian Hart Jan 21 '12 at 13:07
up vote 5 down vote accepted

According to the Googles, IPS is Iron Pipe Straight thread. It's meant to seal on a washer (like the threads the hose for your toilet or faucets attach to). NPT is a tapered thread, designed to seal on the threads, which is why you put pipe tape on them - to lubricate them and help the threads deform and create a seal.

So, while having no personal experience, I would say no, they will not thread together. I've been hunting around for adapters, but don't see anything. Which is weird, because I'd think those arms would be designed to thread into a brass NPTF fitting in the wall/ceiling.

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