Having plumbed a lot of things on a commercial fishing
boat, and having dealt with not only sea water "taps" as you call them, including the faucets in the head, galley and the shop wash sink below deck
, I've found that the "LESS" metal, the better, as "Delrin" "PVC" or related cousins are the best for service
in harsh water like salt water
..being they are impervious to the corrosive nature of the sea. Probably why most ships are turning to flexible plastic (high and low pressure) piping. The fact that these same type of systems are used in the RV industry to be more flexible and better suited to a "Flexible and constantly moving" enviorment.