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Thread: Which shower arm adaptor

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  1. #1
    DIY Junior Member md001's Avatar
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    Default Which shower arm adaptor

    Anyone know how to tell what kind of ball end shower arm you have, in order to determine which adaptor to purchase to turn it into a regular threaded arm? There seem to be at least three of four different adaptor (american standard, gerber, etc.) Perhaps someone knows the diameter of the threaded piece behind the ball joint for the various makes? I'd take the shower head into a store and just compare it to the adaptors, but it seems like not many places actually keep the adaptors in stock. Any help appreciated.

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    Moderator & Master Plumber hj's Avatar
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    If the ball is integral to the shower arm, it was proprietary, possibly PricePfister, but ANY adapter is going to create a very "wiggly" connection which will be unsatisfactory for most users. Replace the shower arm with a threaded one.

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    Plumber jimbo's Avatar
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    The two that I ran into a lot were AmStd and PP. They were about the same diameter, but different thread. You just had to know which you had. The shower arm was made (usually) by the brand who made the shower valve.

    Those adapters are getting scarce, and I don't know any good reason not to just replace the arm.

  4. #4
    DIY Junior Member md001's Avatar
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    Thanks for the comments - that's kind of what I was afraid of. Is changing the shower arm difficult? I.e., do I need to remove tile to do that, or should it just unscrew? I half-heartedly tried to turn it with channel grips and it didn't move (counter clockwise) - I didn't try to hard though, nervous that I can't actually see what I'm trying to twist.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    IF it were to break, and it DOES happen, then it was already cracked and just waiting for an opportunity to break in the wall and give you a flood. Otherwise unscrew it. If it turned EASILY when you tried with the Channelocks, that would have meant it was TOO loose and also probably leaking in the wall.

  6. #6
    DIY Junior Member md001's Avatar
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    Okay, I'll give it a shot. How critical is it to shut off the water supply before taking the arm off?

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