Peggy I have followed the list for some time now and have a manual Jabsco head that is near at least a flapper gasket in the top of the pump. I am considering replacing it with a Raritan PHII- do you still recommend it and if so, have any recommendations on where to find a good price on one. Do you by chance know if there is a footprint showing the mounting holes so I can see how many will show after removing the Jabsco? I will need it to set it up with the pump on the left because of the longer handle on the pump. One other question, I am on a fresh water lake and just put K.O. in last Sunday for the first time on your recommendation, I notice you are talking about Odorlos more and more- which do you think will work best with fresh water intake and factory small vent line. Thanks a bunch, I enjoy reading your list.