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Here are the numbers:

ProSub DLX-IV balanced-diaphragm first stage delivers 2400 liters per minute (lpm).

From a 1995 Scubapro catalog (the 2001 catalog doen't have this info):

MK-15 1st stage @ 3000 psi = 87 scfm = 2464 lpm.
MK - 10 1st stage @ 3000 psi = 73 scfm = 2067 lpm.

The Scubapro MK-15 has only a very slight lead over the ProSub DLX-IV.
 
https://www.shearwater.com/products/perdix-ai/

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