Experience with Dripless Shaft Seals
Most people who have them like them. But be sure to inspect it on a regular basis. If it does fail, it does so in a catastrophic manner -- meaning the boat will sink unless you happen to be right there. I was going to put one on my boat and a yard hand talked me out of it because of the new teflon and Gore-tex stuffing box materials. They are a lot cheaper and just as effective at keeping a dry bilge, albeit with a bit more maintenance. Their main advantage of course is that they have no rubber bellows to blow out unexpectedly, creating a flow of water the bilge pump wasn''t designed to handle.