Parmax 4 24v 40psi has performed perfectly for us for 5+ years now.
I think the previous owner had a 25psi model in there when we took over the boat and it was OK, but the 40psi has plenty of reserve for two showers concurrently. I am not sure how I feel about 55psi except that if it isn't specifically necessary I wouldn't stress all the fittings and clamps to that degree. Well .. 2 cents worth :)Gary W.SM 209, AdagioAnnapolis, MD
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