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Thread: Best QD for connecting under pressure - under water

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    plays with fire RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver is a glorious beacon of light RedSeaDiver's Avatar
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    Best QD for connecting under pressure - under water

    What are people's thoughts on the best low pressure QD for connecting under pressure while under water? I know that some can be a complete b1tch to connect under pressure, and others can be connected but let a small slug of water through.

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    Dave Tomblin wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc has a reputation beyond repute wedivebc's Avatar
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    Re: Best QD for connecting under pressure - under water

    Quote Originally Posted by RedSeaDiver  View Original Post
    What are people's thoughts on the best low pressure QD for connecting under pressure while under water? I know that some can be a complete b1tch to connect under pressure, and others can be connected but let a small slug of water through.
    I don't know of any that don't allow a small amount of water through. I have had best success with QC6
    Cheers,

    Dave....

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    Stéphane Acounis Stephane is a name known to all Stephane is a name known to all Stephane is a name known to all Stephane is a name known to all Stephane is a name known to all Stephane is a name known to all Stephane is a name known to all Stephane is a name known to all Stephane is a name known to all Stephane is a name known to all Stephane is a name known to all Stephane's Avatar
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    Re: Best QD for connecting under pressure - under water

    QC6 or QC4 connectors are not made to be connecter under pressure ... but it works.

  4. #4
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    Re: Best QD for connecting under pressure - under water

    Quote Originally Posted by Stephane  View Original Post
    QC6 or QC4 connectors are not made to be connecter under pressure ... but it works.
    QC fittings are made for use in hydraulics which use much higher pressure than scuba reg IP. Thats why they work in scuba. They will introduce a little water when switching and ISC saw lots corroded solenoids from people detaching and reconnecting them on the O2 feed.
    Cheers,

    Dave....

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    Re: Best QD for connecting under pressure - under water

    DESO (double end shut off) zero inclusion QDs are the bees knees. But expensive

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    Re: Best QD for connecting under pressure - under water

    According to Swagelok's literature, a DESO QC6 will allow 1.0 cc of inclusion and a QC4 will allow 0.3 cc...

    https://www.swagelok.com/downloads/W.../MS-01-138.pdf

    Not much, but still enough to be a concern, IMHO

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    Re: Best QD for connecting under pressure - under water

    I might pay a visit to the local hydraulic parts supply and see what they have to offer - some of the flat face fittings might be an option.

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    Re: Best QD for connecting under pressure - under water

    Quote Originally Posted by RedSeaDiver  View Original Post
    I might pay a visit to the local hydraulic parts supply and see what they have to offer - some of the flat face fittings might be an option.
    Some say Snaptite has very good QD. A bit pricy but very good.

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  9. #9

    Re: Best QD for connecting under pressure - under water

    What's the general opinion on the AP GCS (Gas Connector System)?


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    Re: Best QD for connecting under pressure - under water

    Quote Originally Posted by RedSeaDiver  View Original Post
    I might pay a visit to the local hydraulic parts supply and see what they have to offer - some of the flat face fittings might be an option.
    parker hanifin sell the snaptite 71 series flush face almost zero spill but expensive.

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