NPT v IPS v G

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NPT v IPS v G

Author: wct6110 (MD)

I am changing both the shower head and the angled transfer tube from the water line to the shower head. So I am looking at (in the wall) a 1/2 NPT Female fitting. I purchased a "transfer tube or connector (not sure what to all it) with a 1/2 IPS male fitting. So of course the IPS male does not fit into the NPT female. I found an adapter which is listed as:

G thread female to NPT male.

First Q: Will my IPS male shower tube screw into the G thread female adapter?

Second Q: I guess the second question is if G thread is compatible with IPS.

Thank you.

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Re: NPT v IPS v G
Author: steve (CA) The shower arm is ½" NPT(National Pipe Thread Tapered) and IPS(Iron Pipe Size). G is a standard for British pipe threads. Your new NPT shower arm should screw into the pipe fitting in the wall.
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Re: NPT v IPS v G

Author: wct6110 (MD)

Thank you.

It does not screw into the fixture in the wall. The wall has standard NPT but the shower arm has -- or as I just discovered, NPT "straight thread." So the shower fixture in the wall has normal NPT curved or screw threads and the arm has NPT straight threads. Apparently NPT curved to NPT straight adapters are commercially available.

But does an IPS straight fit into a G thread?

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Re: NPT v IPS v G
Author: Don411 (IN) Forget the adapter, you need to return that "transfer tube" or whatever you bought and get a shower arm with the correct threads.
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Thank you
Author: wct6110 (MD) Yes, agree. Thank you. Edited 1 times.
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