Subject: Re: 1957 3 ltr Heater valve info required
Peter,
not a real answer to your question but may be gives ideas: here is my heater valve, looks not as nice as yours..
See the to rubber sheets that somebody has put in. It seems it can be opened and than you need new seals or the rubber sheet as sort of a membrane. And it seems difficult to get a replacment part so somebody made this himself
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