Problem with the fresh water preassure switch

Paul Osterberg

Where did you order the pressure switch? I'm been looking and found on Amazon (70€), but they got very many I assume 10-30 PSI is the right pressure, but have only found 20-40 psi, but maybe one can adjust down to 10-30 psi?
Did you ordered the one way valve at the same place?

Paul on S/Y Kerpa SM#259