PSS Shaft Seal 1-¼" Shaft 2-¼" Tube

The PSS Shaft Seal 1-¼" Shaft 2-¼" Tube is a marine-grade propeller shaft seal designed to prevent saltwater and freshwater intrusion at the stern tube—a critical junction where drive shafts exit the hull. For anyone who has spent years on the water, you know that water ingress at the shaft log is one of the fastest routes to a ruined engine compartment and costly repairs. This PSS seal is engineered specifically for vessels running 1-¼" diameter shafts with 2-¼" to 2-⅜" stern tubes, making it the right fit for mid-range cruisers, fishing boats, and commercial vessels that demand reliable, long-service sealing.

The seal operates on PSS's proven cartridge design, featuring a carbon cuff that rides against a stainless-steel rotor mounted on the shaft. As the propeller turns, the rotor's rotation keeps the carbon seal pressed against a lubricated chamber, allowing controlled weeping of seawater or fresh water—typically just a few drops per minute—that acts as a coolant and lubricant for the carbon surface. The compressed length of 6.38" fits neatly into existing stern tube installations, while the 7.38" uncompressed dimension accommodates standard shaft log configurations. With a rotor diameter of 2.875" and carbon cuff engineered for smooth, consistent contact, this seal minimizes shaft wear and eliminates the corrosion and pitting that rudimentary rope glands cause over years of use.

Retrofit and replacement work is straightforward: remove the old gland, slide the PSS seal into the stern tube, and secure with your existing hardware—no machine shop or custom fabrication needed. Anglers and liveaboard cruisers particularly benefit from this seal's self-adjusting design; it compensates for minor shaft wear and thermal expansion without requiring periodic tightening like conventional stuffing boxes. Whether you're running a commercial fishing vessel, pleasure cruiser, or expedition boat in saltwater or brackish conditions, the PSS Shaft Seal 1-¼" Shaft 2-¼" Tube delivers years of worry-free operation. Standard installation takes an hour or less, and the peace of mind it provides during extended offshore runs is invaluable.