Packless Shaft Seal (PSS)
There was a thread on the Crusing World BB a while back about this, and the consensus was that stuffing-less seals failed a lot, with pretty dire consequences. A few people recommended a type of flax made from gortex which is advertised as a dripless flax. One or more posters said they''d used it for some time with great results. I''ve repacked my stuffing box with it this year and we''ll see how it goes!