[Jack Houpe]

I think it's the tilton 524, the case that had the nomenclature on it has been missing for probably 15 years or more but looking at the picture the 524 looks like the one that I have. Truly any positive displacement pump would work the only problem is the rubber impeller on most of the water pumps would probably deteriorate over time, the tilton pumps I believe are brass geared pumps although I've never had this one apart it just keeps on working.