PSS Shaft Seal Packing Boxes, Shaft Seals & Accessories

Why PSS Shaft Seal Leads the Packing Boxes & Shaft Seals Category

For boaters who have spent time hunched over a dripping stuffing box, tightening packing glands and mopping a wet bilge, PSS Shaft Seal represents a genuine engineering breakthrough. Browse the full PSS Shaft Seal brand page or dive straight into their Packing Boxes, Shaft Seals & Accessories category to explore the complete lineup.

PSS stands for Packless Sealing System — and that name says everything. Rather than relying on compressed fiber packing that requires constant adjustment and intentionally allows a controlled drip, PSS products use a mechanical face seal approach that eliminates water ingress entirely. The seal is created between a stationary carbon-graphite stator and a rotating stainless steel rotor, pressed together by a flexible rubber bellows. The result is a 100% watertight interface that keeps bilges dry and propeller shafts free from wear.

A Proven Product Line Built for Every Vessel

PSS has developed a tiered lineup that addresses everything from small trailerable sailboats to demanding commercial workboats:

• PSS Type A Shaft Seal — The original and most popular model. Designed for power and sail boats, the Type A features a precision-machined stainless steel rotor, nitrile bellows, and a carbon composite stationary seal. It eliminates the need for traditional stuffing boxes and packing glands, reducing friction and wear while enhancing efficiency and longevity. A "Low Speed" variant is also available for vessels that will not exceed 10 knots, omitting the hose barb fitting for a cleaner installation.
• PSS PRO Shaft Seal — The heavy-duty evolution of the Type A. The PRO upgrades to a Nitronic 50 stainless steel rotor and a multi-ply silicone bellows reinforced with stainless steel rings, engineered to withstand harsher conditions including fuel and oil exposure. It is the right choice for demanding commercial, high-speed, or corrosive-environment applications.
• PSS Rudder Seal — Extends the same face-seal technology to rudder stocks, providing a dripless solution beyond just the propulsion shaft.
• Bellow Maintenance Kits & Accessories — PSS rounds out the category with replacement bellows kits, O-ring kits, shaft retention collars, seal retention collars, silicone hose, and the FlowTrue and Hy-Vent accessories — everything needed to service or install a PSS system properly.

What Sets PSS Apart in This Category

The credentials behind PSS products are hard to ignore. PSS Shaft Seals are certified by Bureau Veritas, ABS, and RINA — three of the most respected classification societies in the marine industry. They are installed as standard equipment by respected builders including Nautor Swan, Little Harbor, and Boston Whaler, and are recognized as the premier retrofit solution on the world market. PSS is headquartered in Seattle, Washington, and brings over four decades of engineering and manufacturing expertise to every product it ships.

The shaft size coverage is equally impressive: PSS seals accommodate shafts ranging from 3/4" (20mm) up to 6" (150mm), with both imperial and metric dimensions available — meaning there is a solution for recreational runabouts, blue-water cruisers, research vessels, and commercial workboats alike. For high-speed vessels operating above 12 knots, a positive water supply line to the seal is required for cooling and lubrication, and PSS provides the accessories and guidance to make that plumbing straightforward.

Whether you are replacing an aging stuffing box on a weekend cruiser or specifying seals for a commercial fleet, PSS Shaft Seal's Packing Boxes, Shaft Seals & Accessories collection delivers a maintenance-free, watertight, and classification-approved solution backed by decades of global trust.