Chris, You perk my curiosity so I pulled out my 1928 Myers catalog and listed under "Miscellaneous Pumps" may be what you are looking for. They show two different General Purpose Double Acting Force Tank Pumps. I can't print although my son is home for a few more days and maybe he can send you a shot out of the catalog. Hope you can find more information. Dick in the beautiful Finger Lake Region of NYS.