Check out the Mountain High website http://www.mhoxygen.com/.
Everything you need should be there.

On 9/14/2018 9:51 AM, John Foster wrote:
Does anyone know the specifics of what kind of regulator is used with the Older MH EDS systems? I’ve been given an older EDS unit but will have to buy a separate oxygen bottle and regulator.

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Dan, 5J