Who can identify this inline pump?

[ocnorb]

Can anyone here ID this pump?

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At first I thought it was an MW, but it doesn't look like the MW pics I can find online. It is on a 1988 DT360.

 

[nevrenufhp]

That is the A-pump. Not such a great pump, but gets the job done. There should be an ID late on the side of the pump, with a "PES6A" then some numbers