Yes the marine has the same protection. I store over 145 gal of fuel between the 3 boats and it is the best for the job. My large boat has twin 318 and an aluminum fuel tank. So far in 4 years no water has been found in the water separators and the fuel from last fall was not varnished or discolored. I am betting over 40,000.oo worth of motors on it with my mechanics blessing.
Art