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PSS 85mm Shaft / 5 1/4in Tub

The PSS 85mm Shaft / 5 1/4in Tub is a top-selling marine mechanical seal designed for maximum performance and reliability. This premium product is the number one choice worldwide and is installed as standard equipment by many reputable boat builders and yards. Its widespread recognition as the premier retrofit seal on the market is a testament to its exceptional quality and durability.

Key Features and Specifications:

• Shaft Size: 85mm
• Stern Tube Diameter: 5.250" - 5.375"

Boat builders and yards recognize the advantages of the PSS Shaft Seal due to its ability to eliminate maintenance, constant adjustment, and costs associated with traditional packing type glands. This innovative seal ensures a 100% water-tight seal, protecting your vessel from water in the bilge and wear on the propeller shaft. The PSS Shaft Seal is easy to retrofit and is available for shafts ranging from 3/4" (20mm) to 6" (150mm), making it a versatile solution for a wide range of marine applications.

How the PSS Shaft Seal Works:

The PSS Shaft Seal is a mechanical face seal that creates a tight seal between the flat surfaces of the rotating stainless steel rotor and the stationary carbon flange. This design allows for minimal wear and maximum performance. The stationary carbon flange is attached to the vessel's stern tube with hose clamps, while the carbon flange is connected to the front side of the bellows with hose clamps. The stainless steel rotor is fitted on the shaft in front of the carbon flange and is secured with set-screws, providing a pre-load that maintains contact between the faces. The carbon flange is bored larger than the shaft diameter, allowing it to "float" around the shaft and compensate for misalignment and vibration issues. This innovative design ensures a long-lasting and efficient seal, providing peace of mind for boat owners and operators.