I have a 1984 Hunter 27 that I purchased in 2013. Don't know the boat/owner history and whether the boat is factory original with the thru hull valves. The installed valves are non-rising stem bronze/copper gate valves that are single clamped. Does anyone know if these are factory installed for that year model boat? I am going to pull the boat for a bottom job and while up and blocked will change if necessary. These valves are not leaking at the packing or at the attachment to the thru hull fitting. The valves just don't look like they belong in below the water line service or meet marine standards. Any help is appreciated.