The MCP600, and MCP650, PSI vs Inches H2O values do not match.
Note that the MCP650 has a higher PSI, but a lower inches value, in comparison to the MCP600.
Which one is the correct value?
In my experience the MCP600 has the higher head over the MCP650, but there are always smallish variations (+/- 10%) between different pumps, but it would be nice to know which between the MCP600 and MCP650 that this reviewer had actually generated more head.
[Edit - seems to be answered in the following PQ graph here]
