Peggy, I wrote a couple of weeks ago about having changed out the "kit" on a Jabsco last Spring. Well, I totally replaced the head this past week (as it was almost as cheap as buying just a kit). When I dismantled the old one to examine the "why" factor, I found that the rubber gasket has deteriorated in just a couple of months. We are no longer using any water from Lake Erie, as we have closed off the thru hull. Instead, we are using a bottle mixture of White Vinegar and regular water to flush (approximately 50/50 mix). Your suggestion about using White Vinegar was taken to heart a couple of years ago, and we have not had ANY odors in our boat since then. However, we are trying our best to keep it that way (as we installed all new lines, per your specs, about three years ago). My question now is this: Do you think that the mix of Wht. Vin and water is overuse of the wht. vin, and may be causing the rubber to deteriorate too quickly??? The condition of this last gasket has caused some concern with me and my fellow dock mates. We are all interested in your response.........Thanks, as always, for your input and ideas!!!