I just took another look at the picture I took and realized the existing pump is a Shurflo (for some reason I was thinking it was a Jabsco). The label states Open Flow 2.8 and GPM 10.8 - not sure what the 10.8 really means but I now think number to use is the 2.8 Open Flow. Since this pump has served well for 28 years, I was thinking on replacing with similar current model such as this one from Defender - Shurflo Aqua King Standard 3.0 http://www.defender.com/product3.jsp?path=-1|51|2234226|2234231&id=613991
Any other strong feelings on Shurflow versus Jabsco versus Johnson pumps?