Skip to main content
✓ Genuine PSS parts  ·  We size it for you  ·  Australia-wide dispatch ✓ Genuine parts · Sized for you Call (03) 5973 6444 Mon–Fri 8–4:30
PSS Seals
Cart

PSS Type A · dripless shaft seal

PSS Type A Dripless Shaft Seal — 90mm Shaft × 7" Stern Tube

Part number: PSS-02-90M-700

PSS Type A Dripless Shaft Seal — 90mm Shaft × 7" Stern Tube: representative photo of an assembled PSS Type A shaft seal
Image shows a PSS Type A seal; your size will differ.
  • Made by PYI Inc, USA
  • Supplied assembled
  • 316L stainless rotor

Genuine PSS Type A dripless shaft seal for a 90mm (3.54") propeller shaft and a 7" stern tube. Its nitrile bellows fits a stern tube outside diameter of 7" to 7-1/8" (177.8–181.0 mm). This is an oversized stern tube for the shaft, so the seal is built with an oversized bellows and a carbon cuff reducer.

Shaft
90mm3.54"
Stern tube
7"Oversized bellows
Fits tube OD
7" to 7-1/8"177.8–181.0 mm

$4,914.00 AUD, including GST.

Special order

Special order: we order this size in for you and dispatch it in 2–3 weeks. Confirm timing before booking installation work.

  • Express Post Australia-wide: $32.95 for one seal.
  • Genuine PSS, from Luxfords Marine: marine suppliers since 1963.
  • Faulty or incorrect? We arrange the return at our cost.
  • Secure card checkout, processed by Stripe.
  • Unsure of the fit? Call (03) 5973 6444, Mon–Fri 8:00am–4:30pm.

Will this seal fit?

A PSS seal is chosen by two measurements: the propeller shaft diameter and the outside diameter (OD) of the stern tube. Check both against this part before you order.

Catalogue specifications
Shaft diameter90mm (3.54")
Stern tube size7"
Fits stern tube OD7" to 7-1/8" (177.8–181.0 mm)
BellowsOversized, with a carbon cuff reducer
Seal typePSS Type A
Part numberPSS-02-90M-700

How to measure

Stern tube Propeller shaft 2 Stern tube OD 1 Shaft
  1. Measure across the bare propeller shaft with callipers, at a clean, unworn section. This seal is for a 90mm shaft (3.54").
  2. Measure the outside diameter of the stern tube where the bellows will clamp over it. This seal fits 7" to 7-1/8" (177.8–181.0 mm).
  3. If your stern tube measures outside that range, choose the size below whose range covers it, or call us and we'll confirm the fit.

Our measuring guide shows where to take each measurement, and the seal finder lists every option for your shaft.

Other stern-tube sizes for a 90mm shaft

We list 11 PSS Type A seals for a 90mm shaft, one for each stern-tube size. Each costs $4,914.00, GST included.

Stern tube Fits stern tube OD Price Availability Product page
4-1/2" stern tubePart PSS-02-90M-412 4-1/2" to 4-5/8"114.3–117.5 mm $4,914.00inc GST Special order
4-3/4" stern tubePart PSS-02-90M-434 4-3/4" to 4-7/8"120.7–123.8 mm $4,914.00inc GST Special order
5" stern tubePart PSS-02-90M-500 5" to 5-1/8"127.0–130.2 mm $4,914.00inc GST Special order
5-1/4" stern tubePart PSS-02-90M-514 5-1/4" to 5-3/8"133.4–136.5 mm $4,914.00inc GST Special order
5-1/2" stern tubePart PSS-02-90M-512 5-1/2" to 5-5/8"139.7–142.9 mm $4,914.00inc GST Special order
5-3/4" stern tubePart PSS-02-90M-534 5-3/4" to 5-7/8"146.1–149.2 mm $4,914.00inc GST Special order
6" stern tubePart PSS-02-90M-600 6" to 6-1/8"152.4–155.6 mm $4,914.00inc GST Special order
6-1/4" stern tube OversizedPart PSS-02-90M-614 6-1/4" to 6-3/8"158.8–161.9 mm $4,914.00inc GST Special order
6-1/2" stern tube OversizedPart PSS-02-90M-612 6-1/2" to 6-5/8"165.1–168.3 mm $4,914.00inc GST Special order
6-3/4" stern tube OversizedPart PSS-02-90M-634 6-3/4" to 6-7/8"171.5–174.6 mm $4,914.00inc GST Special order
7" stern tube OversizedPart PSS-02-90M-700 7" to 7-1/8"177.8–181.0 mm $4,914.00inc GST Special order This seal

See every 90mm size in the size and price chart.

How the PSS Type A is built

The PSS Type A is made by PYI Inc in the USA and supplied assembled, ready to fit. It is a mechanical face seal:

1 Transmission 2 Shaft coupling 3 PSS rotor 4 Carbon flange 5 Bellows 6 Stern tube 7 Propeller shaft Hull
  1. Transmission turns the shaft
  2. Shaft coupling spins
  3. PSS rotor spins with the shaft
  4. Carbon flange stays still
  5. Bellows stays still, holds the faces together
  6. Stern tube the shaft log
  7. Propeller shaft spins

  • Stainless-steel rotor

    A 316L stainless-steel rotor clamps to the 90mm propeller shaft, sealed to it by two o-rings and held by two pairs of set screws.

  • Carbon flange

    The rotor spins against a stationary carbon flange.

  • Nitrile bellows

    A nitrile rubber bellows sized for a 7" stern tube clamps over the stern tube with hose clamps, and its pre-load keeps the two faces together.

  • Water vent

    A hose-barb vent feeds water to the faces to lubricate and cool them.

Inspect the bellows regularly and replace it about every six years with the PSS Maintenance Kit. Read the installation guide before fitting.

Delivery and returns

  • Postage

    Australia Post Express Post for one seal is $32.95, GST included. Checkout confirms the postage for your delivery postcode.

  • Dispatch

    Special order, dispatched in 2–3 weeks. Allow 1–7 business days for delivery after dispatch.

  • Change-of-mind returns

    Not accepted: special-order seals can't be returned for a change of mind once we've ordered them from our supplier.

  • Faulty, damaged or incorrect items

    We arrange the return at our cost and give you a full refund or a replacement.

Read our shipping and returns policy for the full terms. We deliver within Australia only.

Not sure which size you need?

Call us with your shaft diameter and stern tube outside diameter and we'll confirm the fit before you order. Mon–Fri 8:00am–4:30pm.

Call (03) 5973 6444 Open the seal finder