Air tank fitting size question.

Discussion in 'Ask An Owner Operator' started by crucar1800, Nov 19, 2019.

  1. crucar1800

    crucar1800 Light Load Member

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    Sep 21, 2012
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    Hi. I am trying to find out the size of the DOT tub and the size of the air fitting that would fit into these three ports. One tank is the front one and the other the rear tank. Does anyone know the size of these three items? Thanks for your help! air tank2.jpg airtank1.jpg
     
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  2. Judge

    Judge Medium Load Member

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    Newport, Ar
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    5/8 elbow quick connect. Little over $30 each
     
  3. starmac

    starmac Road Train Member

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    Apr 11, 2019
    Fairbanks Ak
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    It is hard to say just looking at the picture, but I am thinking the air line sizes are 5/8 on the black one and 1/2 on the green one, tank fittings will either be 3/8 pipe or possibly 1/2 pipe.
     
    mhyn Thanks this.
  4. PE_Trans

    PE_Trans Road Train Member

    What I personally do is take a picture of it and show it to the parts guy at the dealer along with the last six of my vin. If you’re trying to buy a generic fitting, you would want to take it off, and take it with you.
     
  5. mhyn

    mhyn Road Train Member

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    Northridge, CA
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    hahaha Cascadia started leaking ))))
    I have changed all of them. The thread on air tank is 1/2 NPT. Tube sizes are different. 5/8, 1/2, 3/8,... measure diameters before buying the fittings
    I have Installed Velvac DOT brass compression fittings on air tanks.
     
    Last edited: Nov 20, 2019
    crucar1800 and PE_Trans Thank this.
  6. crucar1800

    crucar1800 Light Load Member

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    Sep 21, 2012
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    Lol...yes. it is hard to keep up with leakcadia.
     
    mhyn, Concorde and PE_Trans Thank this.
  7. Concorde

    Concorde Heavy Load Member

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    Jun 29, 2016
    West Melbourne Florida
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    Don’t feel bad, my Kenworth is the same.
    Fix one leak and two more show up the next day.
     
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  8. mhyn

    mhyn Road Train Member

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    Northridge, CA
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    yes men. Freightliner is using that crape push and lock fittings made by SMC Pneumatics. They start leaking after 3-4 years....
     
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