Shower mixing valve piping

Discussion in 'General Plumbing Help' started by Jayman, Dec 18, 2013.

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  1. Dec 18, 2013 #1

    Jayman

    Jayman

    Jayman

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    During my remodel I uncovered the shower wall with the existing mixing valve. As you can see in the picture the line entering the valve on the right tee's off and jumps from 1/2 to 3/4" or 1" goes up about a foot and then is capped off. Is there a reason for this? My first thought was that the contractor didn't have a 1/2" elbow and then just stuck this in the arrangement?

    mixervalve.jpg
     
  2. Dec 18, 2013 #2

    johnjh2o

    johnjh2o

    johnjh2o

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    That is a hammer arrester. What I don't understand is why there isn't one on the hot.
     
  3. Dec 18, 2013 #3

    Jayman

    Jayman

    Jayman

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    I am installing a modern thermostatic mixing valve to replace this one. Its an externally mounted mixer i.e. not in the wall. Would it be appropriate to install this way on both the hot and the cold? Thank you
     
  4. Dec 19, 2013 #4

    phishfood

    phishfood

    phishfood

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    No, those field manufactured shock arrestors don't do any good after awhile. The air above the water is slowly absorbed into the pressurized water. If you want to install shock arrestors, buy the factory made ones with piston seals that have a gas charge in them.
     

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