While replacing by ball valves with flanged seacocks I discovered that in one of the locations the valve handle is blocked by a bulkhead if the drain plug
is oriented downward. Groco seacocks have reversible handle rotations and two drain valves mounted on opposite sides, allowing many installation
options--good! But they make two lines of seacocks: FBV, chromed brass ball and stem (bad?); and BV, stainless steel
ball and stem (not so good?) at almost three times the cost. Both BV and FBV series are Marine
What are the advantages of the BV series that would justify the much higher cost?