PSS Shaft Seal 1-⅛" Shaft 1-½" Tube

The PSS Shaft Seal 1-⅛" Shaft 1-½" Tube (part number 02-118-112) is a marine mechanical shaft seal engineered to prevent water ingress at the propeller shaft penetration point on boats and small vessels. This seal sits at the critical interface where the rotating driveshaft exits the hull, managing saltwater intrusion and maintaining watertight integrity under continuous operation. PSS shaft seals are the industry standard for both cruising sailboats and powered vessels because they deliver reliable, maintenance-friendly performance in saltwater environments where traditional stuffing boxes fail.

Built to accommodate a 1-⅛" shaft diameter and fit stern tubes measuring 1-½" to 1-⅝" in diameter, this PSS mechanical seal features a carbon cuff, elastomer seal ring, and a stainless rotor assembly that eliminates the weeping drips and frequent adjustments associated with rope-style packing. The total compressed length of 6.225 inches allows straightforward installation in confined engine compartments, while the rotor diameter of 2.375 inches provides effective hydrodynamic protection against sediment and salt crystals. The seal operates via dynamic pressure—as the shaft rotates, the carbon contact face remains perfectly centered, creating a sealed gap measured in microns rather than the loose tolerance of traditional seals.

This seal is ideal for cruising sailors, coastal fishermen, and boat owners who prioritize minimal maintenance and maximum reliability. Whether you're running a single-engine trawler in the Atlantic, a Catalina cruiser in the Caribbean, or a center-console in the Gulf, a failing shaft seal can mean the difference between a safe weekend trip and catastrophic bilge flooding. PSS mechanical seals address this directly—they're recognized by major boat builders as standard equipment and consistently outperform alternatives in long-term saltwater service. Upgrading from a stuffing box or replacing a worn seal takes an hour at the dock and eliminates the weekly dripping that wears on fiberglass and hull structure.