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Either of these are good but the osborn rings are the best and work on either pump. I don't use the ring cones on the osborn pump because it cut the rings. There are sharp edges involved. http://www.stlmedical.com/store/osbon-erecaid-supplies.html?gclid=CjwKEAjw_uvHBRDUkumF0tLFp3cSJACAIHMYnHJ_PS1XR...