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Does any one know what the right spares kit is for a 1986 Nauticat 38 Lavac toilet. I can’t seem to find the right ones to order ? The rocker is moving freely so I suspect the rubber diaphragm internally has perished ? Any other ideas ?
I have the same thing. I am fairly sure it is a standard Henderson Mk V (5) pump and you can get the service kits and much more beside at ASAP (https://www.asap-supplies.com/whale-ak8050-service-kit-for-henderson-mk5?nosto=nosto-page-search1) and other chandleries.
Once you have it apart you might as well replace the two valves and rubber diaphragm.
Best wishes Piers
Although an unpleasant job those spare parts worked well. The only top tip would be to make sure the valve screws are done up very tightly first time.