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  1. #1
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,303

    Default What is it? Pressure Relief?

    I found two of these in the crawlspace of home heated by three 50 gallon water heaters. I did not find any kind of thermal expansion device anywhere, including in the toilet tanks.

    I think there where expansion tanks hanging from the bottom of the 'T' at one time? Don't know why they have been removed.

    What is the device at the top of the 'T'?

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  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,246

    Default Re: What is it? Pressure Relief?

    I'm thinking atmospheric breaks when winterizing.

    Would do no good for thermal expansion or anything else if that valve were turned off.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
    Harry Rezaei's Avatar
    Harry Rezaei Guest

    Default Re: What is it? Pressure Relief?

    I might be incorrect, but the top of the T looks like an Automatic Air Vent..?
    And maybe it can also be a Water Hammer Air Chamber?




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