I have several of these, which are essentially the same pump.
http://www.ebay.com/itm/Buhler-Motor-with-Rietschle-Thomas-Pump-/111022075203?pt=BI_Pumps&hash=item19d96e6d43
It's a higher quality brand but a used item. I had to disassemble two that I purchased to clean the valves. Very...