Looks like the same type roller pump used in gas applications,..I didn't even know they made them to run off 12V. The description states "Also available in Poly and PTFE" If I were to try one it would be one of these,..as I assume the one that one that here is cast iron,..which I wouldn't even consider using for SH use AT ALL,..Especially at this cost. Assuming the one shown is cast,..and it is $586.00,.. I can only imagine the Poly or PTFE (Teflon) are quite a bit more but would be the only choice to even try.
*Would also need to be plumbed with a by-pass
**The gas roller pumps run at around 150 PSI for the same GPM rating as this one,.which is only 60 PSI. Would be nice to have the Poly and PTFE roller available to mate up to a gas engine.
***I used to use the cast iron roller pumps a long time ago,..they did spray well but just didn't last,..but they only cost around $90.00 each.
Jeff