Dear Sir or Madame, I have a 1987 Hunter 28.5 sailboat with a waste holding tank and a manual pump-out system that has a diaphragm hand pump. Attached are two photos of the diaphragm hand pump; the black diaphragm is 5 inches in diameter which I would like to replace with a new diaphragm. Does anyone know where I can buy a new diaphragm or the entire hand pump? Thanks. Billy
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