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The reason I ask is because I immediately went shopping, and found the West marine site has a tip about using bronze or Marelon plastic below the waterline, however it doesn't mention stainless, although they sell plenty of it...https://www.westmarine.com/west-advisor/Brass-Bronze-and-Plastic-Fittings.html
Either metal is fine below the water line but one issue with the metals. They should have a sacrificial anode on them. The groco sea cock comes with them as these items are in the water and metal.
 

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Cost is about the only factor Dave. But, do it once and be done forever.
 
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Either metal is fine below the water line but one issue with the metals. They should have a sacrificial anode on them. The groco sea cock comes with them as these items are in the water and metal.
If you ground your metal fittings to the boat you only need the one anode.
If your fittings are all in the rear bulkhead a short wire to one of the engine mount bolts would complete the circuit.
 
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