Separate thru-hull and line to stuffing box
Wrong wrong wrong, the dripless stuffing boxes don''t get their lubrication from a seacock, they are submerged in water, how much more do they need? This sounds like a great way to sink the boat!
The dripless stuffing boxes need to be burped (like sailormitch after too many beers) of the air they sometimes trap, a hose leading from the stuffing box to above the water line (when the boat is healed) should do the trick. The things you read on the internet???