The drip free self aligning Tides Marine SureSeal FSK-4000-7000-1 inboard propeller shaft seal is made from fiber-reinforced composite material, and is unaffected by temperature and will not absorb water. Order your Tides Marine SureSeal FSK-4000-7000-1 prop shaft seals today from Deep Blue Yacht Supply and save. The Tides Marine SureSeal FSK-4000-7000-1 measures Shaft Size: 4 inches, Stern Tube O.D.: 7 inches, Compressed Length: 9-1/4 inches