The drip free self aligning Tides Marine SureSeal FSK-3750-5500-1 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-3750-5500-1 prop shaft seals today from Deep Blue Yacht Supply and save. The Tides Marine SureSeal FSK-3750-5500-1 measures Shaft Size: 3-3/4 inches, Stern Tube O.D.: 5-1/2 inches, Compressed Length: 8-3/4 inches