High pressure tanks have an output of 800psi while low pressure tanks have an output of 400psi. There really is no other difference aside from that. Both will probably work fine on your marker, but I would suggest an HP tank anyway.

HP or LP really has no effect on the marker. The only thing that works harder is the regulator when using an HP tank, since it needs to regulate a higher pressure down further to the opitmal operating pressure of your marker. I have used HP and LP interchangably on numerous different markers (DM4/5, Ego, Autococker, Shocker) one after the other without seeing any change in performance.

So after that long winded explanation get yourself a quality high pressure tank.

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