PSS Shaft Seal 3" Shaft - 5-1/2" Stern Tube
SKU: 61537436956

PSS Shaft Seal 3" Shaft - 5-1/2" Stern Tube

Sale price$576.00 Regular price$640.00
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Description

PSS Shaft Seal 3" Shaft - 5-1/2" Stern Tube3" Shaft 5 1 2" Stern Tube The PSS Shaft Seal is the #1 selling marine mechanical seal worldwide and is installed as standard equipment by many of the worlds most reputable boat builders and boat yards. The PSS Shaft Seal is also recognized as the premiere retrofit (aftermarket) seal on the world market. Boat builders and boat yards recognize the advantages and value of installing the PSS as it eliminates the maintenance, constant adjustment & cost

3" Shaft - 5-1/2" Stern Tube

The PSS Shaft Seal is the #1 selling marine mechanical seal worldwide and is installed as standard equipment by many of the worlds most reputable boat builders and boat yards. The PSS Shaft Seal is also recognized as the premiere retrofit (aftermarket) seal on the world market. Boat builders and boat yards recognize the advantages and value of installing the PSS as it eliminates the maintenance, constant adjustment & cost associated with traditional packing type glands. Aside from these benefits, the PSS Shaft Seal helps to eliminate water in the bilge (100% water tight) & wear to the propeller shaft. 

How Does it Work?

1. Two nitrile o-rings seal the stainless steel rotor to the shaft and will not experience wear.

2. A primary set screw and a backup set screw (2 sets) are used to secure the stainless steel rotor to the shaft.

3. A seal is created between the two flat surfaces of the carbon stator and the stainless steel rotor.

4. Water is fed into the PSS Shaft Seal for cooling/lubricating the seal faces on high speed vessels.

5. The stationary carbon stator is attached to the nitrile bellow, which is attached to the stern tube (shaft log).

Rotor

The PSS stainless steel rotor is slid down the shaft and is secured to the shaft with set screws at 90° for maximum holding power. Precision tolerances are maintained by computer controlled lathes. The faces have a number 9 micro finish and are perpendicular to the bore to prevent run-out as the collar rotates. The carbon graphite stator will polish the face of the rotor during the first few minutes of operation. The stainless steel rotor should not need to be replaced under normal operating conditions. The stainless steel rotor used on the PSS Type A Shaft Seal is made from 316L stainless steel. 

Carbon Stator

The high density, resin impregnated carbon/graphite stator is a composite that is first mixed, molded and then formed under pressure. The blanks are then baked, machined and lapped. The face of our carbon is finished to a flatness of 4 helium light bands (measured .000044" of variation over entire lapped surface). The grade of carbon used in the PSS has an operating temperature over 500° Fahrenheit (+260° Celsius), and cannot melt if the seal runs dry, unlike a rubber lip seal or plastic face seal. The high density of the carbon greatly increases the longevity and wear resistance. Several commercial vessels have recorded over 40,000 (over 4-1/2 years of continuous operation) engine hours on the same, original components. The carbon should not need to be replaced under normal operating conditions. 

Bellow

The PSS Type A Shaft Seal bellow is made from rubber (Nitrile), and has a temperature rating of -25°F to +225°F (-31°C to +107°C). Nitrile is known for its resistance to weathering. Nitrile rubber is exceptionally resistant to oils and non-polar solvents. It also offers good gas impermeability, abrasion resistance, and better thermal stability than most general purpose elastomers. 

Hose Barb

For high speed vessels it is required that a positive water supply be plumbed to the PSS Shaft Seal for the purpose of lubricating and cooling the seal faces. There are many sources of water supply, review the PSS Shaft Seal Installation Instructions for more information and note all plumbing must follow the standards and practices of proper boat plumbing. In most cases a slow speed boat that does not have a bearing the shaft log does not require positive water feed and can simply be "vented". Ideally the vent line will be run at least 2-3 feet above the water line and is close to the center line as possible to ensure the vent hose is never below the water line, even if the boat heels. Review the PSS Shaft Seal Installation Instructions for more details on venting the seal.

Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 61537436956

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JohnMichael Rodriguez
Pawtucket, US
★★★★★ 5
Finally, a toy my dog hasn’t murdered
If your dog destroys toys like it’s their full-time job, this stick is the boss-level challenge they didn’t see coming. I gave it to my power-chewer (a pit mix with jaws of steel), and after a week of gnawing, tossing, and dramatic tug-of-war battles, it’s still intact. Not even a dent. I think it might be made of space-grade rubber or the same stuff they use in black boxes. It’s got a good weight to it — heavy enough to feel solid, light enough to toss without pulling a shoulder. No squeaker, no fluff, no sad stuffing guts all over the living room. Just pure chewable glory. Pros: • Actually indestructible (or close enough) • Great for aggressive chewers • No squeaker = peace and quiet • Easy to clean and doesn’t smell weird • Doubles as a fetch toy and chew stick Minor feedback: It’s a bit heavy for small dogs, and it doesn’t bounce or squeak — but if your dog’s into serious chewing, they won’t care. Also, don’t drop it on your foot. Trust me. Final thoughts: This toy is the Chuck Norris of dog sticks. If your pup has shredded everything else, give this a shot. It might just survive — and so might your sanity.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 7, 2025
M
Verified Purchase
Matt
Lake Worth, US
★★★★★ 5
Durable
If you have an aggressive chewer this will hold up for about a month. After about a month of daily use my police k9 will get the ends off. Is it completely indestructible no, does it hold up better then any other toy he’s had absolutely. When you have a dog with super high toy drive you understand nothing is indestructible but I will say a month for a toy to last with my dog is great and I accept the fact I just have to buy new toys monthly. For reference my dog will destroy a Kong in about half the time.
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Reviewed in the United States on April 25, 2026
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Verified Purchase
Dana
Natrona Heights, US
★★★★★ 5
GREAT DURABILITY FOR MY XL SUPER CHEWER !
My dog LOVESSSSS this toy. It’s definitely one of her favorites! I have a Pit-Mastiff mix and she loves to chew toys, but her breed also means she’s got an outrageous amount of strength in those jaws, making it hard to find toys that can last without getting torn up super easily. We typically buy Kong “Super Chewer” toys and this has held up better than those! We’ve had it a good few months and it’s super durable. She gnaws on this thing every day for a good bit of time, and it doesn’t have any weak spots, holes, chunks missing, NOTHING, except a few dimples. It’s firm but also has give to it that (I think) really provides a good chewing option. It’s got enough weight and give to it that I can throw it for her and it’ll bounce without flying around crazy like some toys. The toy itself is not super cute, but my dog definitely is when she’s carrying it around everywhere 🥹 My only con is that I wish it came in other colors! I was surprised that she liked it so much because she typically prefers bright colored toys like red/orange/blue/green. It took some time, but once she warmed up to it and realized she could chew as hard as she wanted on it, it was game over from there.
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Reviewed in the United States on October 11, 2025
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Verified Purchase
Marty
Lowell, US
★★★★★ 4
Durable dog toy
Solid toy for Malinois
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Reviewed in the United States on March 26, 2026
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Debi Mason
Omaha, US
★★★★★ 5
Extremely Durable
This is truely for heavy chewers. Both my bully mixes have chewed through every bone/ball including Kong. They have had these for about 6 months and they are hardly worn. The dogs love chewing on them too. I wish they came in flavors.
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Reviewed in the United States on April 5, 2026

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