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Thread: Additional knob/valve inside shower wall

  1. #1
    DIY Junior Member JohnNJS's Avatar
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    Default Additional knob/valve inside shower wall

    Hi,
    First time posting in the forum - hope i get it right. I'm a plumbing novice and am not sure what the additional knob below my shower handle stem is. I've been trying to find out via the internet but it's difficult because i don't know what to search for. Most pictures of two-handle system (e.g. here http://www.diyadvice.com/diy/plumbin...m-compression/) do not show the lower knob or valve.

    I'm assuming it is, or was (my construction is original 1971) common as these tear-drop escutcheons are something i've seen a lot and I assume were intended to disguise this additional part. However that is as far as my deduction has taken me.

    Has anyone seen this part? What does it do? I thank you in advance.

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  2. #2
    DIYer, not in the trades LLigetfa's Avatar
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    My guess is they are integral shutoffs so that you can work on it without having to turn off the entire house.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Well, an integral set of shutoffs would be that, a set, and there's only one!

    If I had to guess (I'm not familiar with many different ones), it might be either the spool pressure balance valve, or it's a max temp adjustment.
    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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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Quote Originally Posted by jadnashua View Post
    Well, an integral set of shutoffs would be that, a set, and there's only one!

    If I had to guess (I'm not familiar with many different ones), it might be either the spool pressure balance valve, or it's a max temp adjustment.
    The one your looking at is on the cold side. The second one would be on the hot side. It's a two valve shower valve.

    John

  5. #5
    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by jadnashua View Post
    Well, an integral set of shutoffs would be that, a set, and there's only one!

    If I had to guess (I'm not familiar with many different ones), it might be either the spool pressure balance valve, or it's a max temp adjustment.
    I reject your reality and substitute my own.

  6. #6
    DIY Junior Member JohnNJS's Avatar
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    Alas johnjh2o1 is quite right, i should have attached a photo of the entire set-up. Here it is:
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    Based on LLigetfa's suggestion, i found this: http://blog.********.com/2009/06/sho...does-that.html
    Perhaps that is it. It is either stuck or requires a key, as it does not turn with a screw driver.

  7. #7
    Moderator & Master Plumber hj's Avatar
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    They usually snap the slotted head when you try to turn them. Usually completly useless after a few years.
    Licensed residential and commercial plumber

  8. #8
    DIY Junior Member JohnNJS's Avatar
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    Quote Originally Posted by hj View Post
    They usually snap the slotted head when you try to turn them. Usually completly useless after a few years.
    Oh no! Bad news. Thank you for letting me know. Do you know if, when that happens, it creates disaster (i.e. water spraying out)?

    Also, any use spraying on some penetrating oil or something on it before I try it out?

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