DHS,
The pump is plastic (black with a smail round bronze screen in the back). It is exactly what was on my PT-422.
The tractor parts place I bought it at has this number: 16700-2L80B. I don't know if that is the parts place in-house number, or the Honda dealer part number.
No, I don't know what Honda eng. it was designed for.
As I said before, when I told the guy what I needed, he said, "They are all the same, just different prices from different companies."