Medical Gas Professional Healthcare Organization

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Dental Air Fittings

  • Friday, November 16, 2018 4:48 PM
    Message # 6911169

    Does anyone consider "ProPress" ( https://www.viega.us/en/products/innovations/viega-propress.html )  a compression type fitting?  


    It is lacking the traditional ferrule or compression ring seen in all other types of compression fittings, and it is certainly not a flare or brazed connection.  I believe it is a pressed fitting as the name implies.  Anyone have any thoughts here?

  • Saturday, November 17, 2018 10:40 AM
    Reply # 6911779 on 6911169
    Al Moon (Administrator)

    Would like to help.

    How does this question pertain to medical gas piping system per NFPA 99?


  • Saturday, November 17, 2018 12:53 PM
    Reply # 6911919 on 6911169
    Mathis Carlson (Administrator)

    Al, I would guess he's looking at Dental Air/Vac and if pro press could be used under solder or compression as allowed joining methods. (Guessing here)

    According to Viega's approval documents they consider it a compression fitting. The copper is compressed around the gasket(O-ring). A very similar principal to a compression nut and ferrule, but an o-ring in stead of the feerule and the pressure from the press tool instead of tightening the nut. 

  • Saturday, November 17, 2018 12:58 PM
    Reply # 6911950 on 6911169

     So if med gas is not involved what about shark bite? 

  • Sunday, November 18, 2018 8:35 AM
    Reply # 6912674 on 6911169
    Al Moon (Administrator)

    OK from what I can get from the WWW:


    1) Pro Press is Good


    2) But Shark Bit has this, in their specializations.


    Design certified to NSF/ANSI 61 and ASSE 1061 product standard for use in potable water and hydronic heating water distribution:

    Approved to be used underground and behind walls without accesspanels. o Designed for hydronic heating as well as potable waterdistribution.

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