The only modifications I know of is for the connection at the out put fitting to get the hose to connect.
I have heard of others going into the innards and "making adjustments" but to my way of thinking that is just trying to get more out a machine than it is designed to deliver.
You can gang the outputs of machines with the same pressures together to increase the volume of flow (3 machines with 5 lpm output {which only deliver about 3.5 lpm at highest purity} will deliver something like 11 lpm of the same purity) but you can not mix pressures very successfully.
You would be better off getting one of those Homefil Oxygen bottle filling machines and use that to pressurize tanks ( as long as you get the hose rigging and regulator that can handle 3 thousand psi ) and use the tank for torching once filled.
And there are full threads of conversation trying to find the parts, hoses and warnings about high pressure set ups at home.
Search for "homefil".
It goes without saying that you probably want to replace all three filters.
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The Zombie Apocalypse is Upon Us.
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