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I'm sure the shaft is 20mm. Also, it uses a square, 4-hole bolt pattern. The 7/8" pumps I've seen use a triangular, 3-hole bolt pattern.

I know this is a lawn mower repair forum, but I figured I would try my luck. I bought a used Karcher G2500VH pressure washer with no water pump. Using a caliper, I found that the shaft from the Honda GCV 160 engine is exactly 20mm (a hair over 3/4"). I haven't been able to find this water...