PSS Shaft Seal 2-12 Shaft 4 TubeShaft Diameter 2-12Stern Tube Diameter D 4Total Length A 9.625Total Length compressed Compressed A 8.375Rotor Diameter B 4.2Carbon Cuff Diameter C 3.75Stern Cuff Length E 2The PSS Shaft Seal is the number one selling marine mechanical seal worldwide and is installed as standard equipment by many of the worlds most reputable boat builders yards. The PSS Shaft Seal is also recognized as the premiere retrofit aftermarket seal on the world market. Certified by Bureau