Help on ID'ing an old CAT pressure washer pump

[shawn022]

Trying to ID this old pump so I can locate seals for it. Its attached to a gx160 honda. Made by simpson and sold as a Sherwin williams washer. The simpson tag has the model as PS1500CHS. Only number on the pump is 0920180 which I believe is a serial number.

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[shawn022]

Turns out to be a 2sf pump