PSS Shaft Seal 02078112 Packless Sealing System 7/8" Shaft

The PSS Shaft Seal 02078112 is a mechanical face seal designed for 7/8" propeller shafts on marine vessels. This packless sealing system replaces traditional packing glands and is installed by boat builders and specified by the USCG as standard equipment on many vessels.

Key Features:

• Dripless operation eliminates unnecessary bilge pumping and keeps your bilge clean and dry
• Mechanical face seal design provides reliable, maintenance-free performance
• Fits 7/8" diameter shafts
• No adjustment required during normal operation
• Reduces corrosion and hull blistering by eliminating saltwater intrusion
• More efficient than traditional stuffing boxes—no water drag on the shaft

The PSS system uses a stainless steel rotor that rotates with the shaft and a stationary carbon/ceramic stator that remains fixed to the stern tube. A flexible bellows maintains constant pressure between the two faces, creating a watertight seal without the need for traditional packing material or maintenance adjustments.