· Master Mariner
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Before you replace a perfectly good seacock, I'd check out some of the repair threads on them on here and other sites. The green is nothing necessarily bad. Many seacocks have a nut or T-handle opposite the valve handle, which, when loosened allow the tapered pin to move. It is highly unlikely the thru-hull is bad; I've seen silicone bronze thru-hulls around 100 years old and in great shape. They do require servicing and lapping from time to time though.