PSS PRO Maintenance Kits - For 1-1/4" to 3-3/4" Shafts

9 total reviews


$ 165.00

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Size Guide
  • Description

    As with any rubber / silicone hose below waterline, the PSS PRO bellow must be inspected on a regular basis for any signs of wear, aging or chemical deterioration. PYI suggests preventative maintenance with a precautionary replacement recommendation in 8-10 year intervals. During bellow replacement it is recommended that the o-rings & set screws in the stainless steel rotor also be replaced.

    Please be sure to never use the same set screw on the shaft twice. There are two set screws in each of the two holes in the stainless steel rotor. One is tightened onto the shaft and the other is tightened onto the first to lock it in place against the shaft. The set screws are made with a cup at the base that compresses into the shaft ensuring a secure grip. PYI's PSS Maintenance Kit comes with five new set screws included. When re-installing the rotor please use new set screws. In the case that you do not have spare set screws, the set screws in the rotor need to be reversed so there is an unused cup being compressed onto the shaft.

  • Includes

    PYI offers a PSS PRO Maintenance Kit that includes the items you need to properly maintain your PSS PRO Shaft Seal. Included in the kit is:

    1. Silicone Bellow - 1qty
    2. Bellow rings – 3qty (Standard on sizes 2-1/4" (60mm) to 3-3/4" (95mm) and optional for smaller sizes)
    3. Nitrile o-rings - 2qty
    4. 316SS Hose clamps - 4qty
    5. Tube of Thread Lock - 1qty
    6. Allen key - 1qty
  • Documents
    1. PSS Type A & PRO Shaft Seal Installation Instructions
    2. PSS Type B Shaft Seal Installation Instructions
    3. PSS Shaft Seal Warranty

Customer Reviews

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How Does It WOrk?

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

2. The Shaft Retention Collar is attached to the shaft and helps retain the propeller or rudder shaft in your vessel in the event of catastrophic failure of the coupling or if the shaft comes free from the coupling.

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

4. A seal is created between the two mating faces of the carbon stator and the stainless steel rotor.

5. Raw water is fed to the PSS Shaft Seal for cooling / lubricating the seal faces on high speed vessels.

6. Hose clamp tail protection, Clamp Jackets.

7. The stationary carbon stator is attached to the bellows, which is secured to the stern tube (shaft log).

8. 316SS hose clamps with rolled edges and non-perforated band.

Shaft Retention Collar for PSS PRO Shaft Seal

Shaft Retention Collar

The PYI Shaft Retention Collar is designed to help retain the propeller or rudder shaft in your vessel in the event of catastrophic failure of the coupling or if the shaft comes free from the coupling. The double split design provides the maximum in axial holding power with the benefit of quick and efficient assembly with the shaft installed. Design fully engages the shaft without marring. Easily installed where major disassembly would otherwise be required. Greater axial holding power than set screw or one-piece clamping collars. Effective on hard and soft shafts.

Stainless steel rotor for a PSS PRO Shaft Seal


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 for a PSS PRO Shaft Seal

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.


The PSS PRO Shaft Seal bellow provides the best combination of durability, strength and elasticity. It's constructed of four ply aramid / silicone with a flurosilicone outer. This flurosilicone cover creates an oil and fuel resistant barrier protecting the exterior surface from the possibility of damage from splash or spill. Both ends of the bellow are sealed. The four ply cloth inlay provides excellent strength and resistance to abrasion. This bellow has a continuous operating temperature range of -90°F to +425°F (-70°C to +220°C).

Installation Video

Customer Reviews

Based on 9 reviews
Robert Buron

You can't beat these guys to work with! Tom Johnson worked with me on whether to go with the type A nitril or the PSS Pro seal dripless maintenance kit. I went with the improved Pro Seal kit because I feel the quality is really off the CHARTS! Again these guys really are great to work with! Thanks for all your help Tom!!
Robert A.Buron

GARY Mackenzie
1-1/4-3-3/4 kit

Great service super fast shipping love there products ease of installation and quality for years of service

David Hoy
New shaft seal bellows.

Since we were hauled out for other preventative maintenance, and I had no record of when the shaft seal had last been serviced, I chose to replace the bellows. Hardest part of the job was getting the shaft coupler off, after than it was simple and easy to remove the stainless rotor collar, carbon disc, remove and replace the bellows, and reassemble the whole thing. Parts were shipped quickly too, had them in plenty of time.

Leroy Craytor

Quick and Fast

Sylvain Angers
Spare parts

Great service like we love !