We have two of these pumps, but do not use them any more as we have switched to electric.
Both are available: Diaphragm pumps, Powerpro motor (Honda knock-off), complete with manuals.
The pumps were actively running until we put them away (they have been stored inside, covered in plastic). We used them to pump sap back 2400 feet uphill to the sugarhouse.
These pumps are available for $300 separately, or at $500 for both.
Contact JP Welch at welch@justameretreefarm.com or call 413-238-5902.