PSS Shaft Seal 1-¾" Shaft 2-¾" Tube

The PSS Shaft Seal 1-¾" Shaft 2-¾" Tube (MPN: 02-134-234) is a marine mechanical shaft seal engineered to prevent water intrusion and oil leakage at the stern tube—one of the most critical sealing points on any vessel. This is the industry-standard solution for sailboats, trawlers, and cruising yachts where reliability at the shaft exit cannot be compromised. The PSS shaft seal has become the preferred choice for both original equipment manufacturers and refit installations worldwide because it eliminates the mess and maintenance burden of traditional packing glands while delivering dependable performance season after season.

This model is sized specifically for 1-¾" shaft diameters and 2-¾" to 2-⅞" stern tube diameters, with a total installed length of 9.175 inches (compressing to 8.175 inches under normal operating load). The rotor diameter of 3.75 inches and carbon cuff diameter of 3.25 inches work together with the dual-stage sealing design to create a flexible barrier that accommodates minor shaft runout and vibration—conditions that defeat conventional packing. The 2-inch stern cuff length provides adequate grip without excessive drag. These dimensional specifications mean the seal performs reliably across a wide range of shaft speeds and sea states, from displacement cruisers to faster planing hulls.

Cruising boat owners choose PSS shaft seals because they reduce shaft maintenance, virtually eliminate weeping oil stains on the cockpit sole, and provide greater security when extended offshore. Weekend fishermen appreciate the simplicity—no annual repacking, no guessing whether the gland is adjusted correctly. Retrofit installers value the broad compatibility range and the straightforward installation process that doesn't require hauling or extensive machinery work. The PSS seal is equally at home on a classic wooden yacht, a modern fiberglass cruiser, or a working trawler.