PSS (Packless Sealing System) Shaft Seal from PYI Inc. This does not drip, and requires little or no maintenance or adjustment.
A possible downside is that if the packing in a stuffing box starts to fail, you simply get an increased drip rate. If a PSS fails, it usually does so with a very substantial inflow that is difficult to stop, and that your bilge pump may even have difficulty keeping up with.
Written by Liam Fitzgerald