The PYI PSS Packless 02312514 shaft seal is a dripless stuffing box and packing gland replacement for sailboat and power boat drivetrains. The PYI PSS packless dripless 02312514 shaft seal is a mechanical seal that uses a self-aligning carbon-graphite stator to ensure a 100% watertight seal. The PYI PSS Packless 02312514 shaft seal will eliminate shaft wear and minimize corrosion. Save big on PYI PSS Packless 02312514 shaft seals for inboard prop shafts. The PYI PSS Packless 02312514 shaft seal measures Shaft Size: 3-1/2 inches, Stern Tube O.D.: 5-1/4 inches, Compressed Length: 9-3/4 inches