[CoolROD]

I used to use similar looking pumps to transfer photoimaging liquids. I don't recall any special handling requirements of the liquids -though they were corrosive. I have seen these pumps in industry where a large volume of liquid was not required.

Even though you have 1/2" ports -I am betting the pump provides moderate volume.

I am often fooled by automotive submersible fuel pumps -they look (and sound) like they would be a reciprocating type (that is probably hard with DC), but they have been rotary.

If this pump is reciprocating -you are wasting energy reciprocating.

Sorry I can't add more valuable content.

Please post whether or not you are going to bid -I am curious...