Seacock valves on 1988 23 Scepter

[JohnB]

I am slowly going thru and inspecting replacing wiring/plumbing/etc on my boat (have had it
2 months). The boat has 2 seacocks (1 for washdown, the other for livewell). They are pretty
crusty and I would like to replace them. Question??? Is this original seacraft equiptment,
or was is it added later? and what are the odds if I put a wrench on them they will come off
or are they likely to break/snap off? Thanks John