Yamada NDP-20BSN series Air Powered Double Diaphragm (AODD) pumps provide a maximum flow rate of 28 gallons per minute. I have not verified that they work since I have no way of doing so but they came out of some very high end military equipment that was still in great shape so I see no reason why they wouldn't still be functional.
Please contact me with any questions. The item "Yamada Stainless Steel Diaphragm Pump 3/4 Ports NDP-20BSN" is in sale since Monday, July 19, 2021. This item is in the category "Business & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Pumps & Pump Accessories\Vacuum Pumps\Diaphragm Pumps". The seller is "bmbound" and is located in Garden Valley, California.
This item can be shipped to United States.