PSS PRO Shaft Seal 3" Shaft & 4-1/2" Tube

The PSS PRO Shaft Seal 3" Shaft & 4-1/2" Tube is a precision marine and industrial shaft sealing component designed for applications where water ingress and contamination must be eliminated. Built for both military and civilian watercraft, pumps, and propulsion systems, this shaft seal delivers the reliability demanded by operators working in demanding environments. Whether you're maintaining tactical waterborne equipment, commercial vessels, or high-performance machinery, this component prevents catastrophic seal failure that could compromise mission-critical operations.

PSS PRO seals feature progressive lip design and advanced elastomer compounds that maintain consistent performance across extreme temperature and pressure ranges. The 3-inch shaft diameter specification pairs with the 4-1/2-inch tube configuration to ensure proper interference fit and load distribution, minimizing radial play while maximizing seal life. This design eliminates the need for frequent maintenance intervals typical of older packing gland systems, reducing downtime and operational costs. The seal's dual-action geometry provides both static and dynamic sealing surfaces, protecting bearing assemblies and reducing vibration-induced degradation.

Operators of patrol boats, rigid hull inflatable craft, and propulsion test systems benefit most from this seal's proven track record in saltwater and freshwater environments. Installation requires standard shaft preparation and straightforward bore mounting—no specialized tools or extended downtime. This replacement seal is compatible with existing PSS housings and integrates seamlessly into legacy marine propulsion configurations. At just 1 pound, the compact form factor simplifies inventory management while delivering the durability expected in both military and commercial maritime applications.