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Thread: Moen Tub/Shower piping size & cartridge replacement...

  1. #1
    DIY Junior Member Why did I try this?'s Avatar
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    Default Moen Tub/Shower piping size & cartridge replacement...

    Hi,

    My original tub/shower piping is 1/2" i.d. but then goes down to these narrow elbows into a Moen 1016p valve body. Is it standard to have the pipe connect in the valve body instead of o.d. of the valve body?

    Thank you

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    A picture may be nice. Are you talking about street 90 bends into a Posi-Temp valve?

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Many shower valves have male threads to accept a female threaded connector from the supply line. But, the inside of that valve is often bored out to accept the pipe in as if it was a coupling (i.e., it is the proper sized socket for accepting the supply pipe to be soldered in). Without seeing what you have, it probably is okay, but we'd need to see it to be sure.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    Here it is Name:  Valve.jpg
Views: 279
Size:  29.7 KB
    My guess is that it is 3/8" i.d. The outside appears to be 1/2". The actual bent part, not the elbow openings.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    The connection IS 1/2", but then they connect 1/2" PEX to it which DOES decrease the i.D. to about 3/8".
    Licensed residential and commercial plumber

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