I cannot provide details, but I can tell you that the two next to the engine in Selene are Groco bronze. The others vary by size and manufacturer. Selene has 5 under the waterline; the two adjacent to the engine, the raw water intake in the bilge, and two seacocks in the forward stbd storage compartment, for the head. The others are above the waterline. I hope this helps - I can investigate more if required, but won't be on the boat for a week or so.