Serving sailors online since 1997

PSS Shaft Seal

Hailed as the best way to a dry bilge!

The PSS Shaft Seal (stands for Packless Sealing System) is a maintenance-free, 100% dry stuffing box and packing gland replacement for your sailboat or powerboat. It's dripless operation eliminates needless bilge pumping, and wet bilges! The PSS is maintenance free; no more packing and repacking. And costs are reduced because it eliminates shaft wear and minimizes corrosion. For a boat owner, the news couldn't get much better!

How Does The PSS Mechanical Shaft Seal Work

A mechanical seal is created by the contact of a turning surface against a stationary surface. The PSS Shaft Seal's stationary surface is a carbon flange held in contact against a stainless steel rotor which turns with the shaft. The carbon flange is attached to the boat by a nitrile bellow which, with the help of water pressure, produces a constant contact between the carbon and the stainless steel ring. This seal is unaffected by engine motion or vibrations. The result is a 100% watertight and totally maintenance-free seal.

What do I need to know to order

All you need know is the diameter of your shaft and the outside diameter of your stern tube. You can use calipers to measure both, or if they are not large enough simply use a string. Wrap it around the tube, lay it out and measure the straight length and divide by pi (3.14). This will give you your diameter.

Select the proper dimensions below. The Shaft Seal ships with detailed installation instructions, or view them online.
To see prices or purchase:

Select your shaft diameter and stern tube diameter below:

1. Choose a shaft diameter

If your prop shaft
is spec'd in inches


If your prop shaft is
spec'd in millimeters

2. Choose a stern tube diameter

Leaves warehouse: 2 business days

Shipping time: see chart

Made to order: Yes

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