Seacock warning, probably most relevant to Australians

[s/v Jedi]

Originally Posted by NevilleCat

Doubtful, even the one in their online picture has a brass shaft. Or at least a brass coloured shaft! I'm going to have a decent look at their current one tomorrow and maybe I will put a magnet over it too!
Maybe the brass shaft de-zinced? What would that look like? Coppery I guess.

If it’s brass then you found the problem. The best ones like a flanged seacock from Groco are bronze with a stainless steel ball and shaft. To save money, the valves that go on top of their flanged adapter have a chromed brass ball but a stainless steel shaft and handle. These are very easy to replace so can be a little cheaper.

Replacing a valve on a fitting that is installed European style is tricky as well because the force required to turn the valve may well turn the skin fitting and cause it to leak or even break off. The only thing that prevents it from turning is the sealant. A flanged adapter is bolted down and putting force on the valve does not load the skin fitting at all.