pump is RotoFlow by Fluid-o-Tech, model PO811V.
This is a brass pump and direct replacement for the procon that came on unit new.
Hope this helps.
I set at 48 PSI and have no problems so far.
procon pumps
I brought mine from dultmeier sales and so far have good sucess.
Only replaced presoak on both my units last month, been in use 3 1/2 years.