Brand Guide

Dripless Shaft Seal Brands: An Honest Comparison

Shop for a dripless shaft seal and you'll keep meeting the same handful of names: PSS, Tides Marine, Glide, Lasdrop and — on Volvo-powered boats — Volvo Penta's own seal. Any of them, correctly sized and serviced, will keep your bilge far drier than the stuffing box it replaces. But before you weigh up brands, it pays to understand the one design split that actually matters: lip seals versus face seals.

In every lip design, something rides on the propeller shaft — the shaft is part of the sealing interface. In a face seal, the sealing surfaces are off the shaft entirely: two faces bear against each other while the shaft simply passes through. We unpack the engineering in our rubber shaft seal vs dripless guide; here's how it plays out brand by brand.

The dripless shaft seal brands you'll meet

PSS Type A

The PSS Type A, made by PYI Inc in the USA, is a mechanical face seal: a 316L stainless steel rotor clamped to the shaft spins against a stationary carbon flange lapped flat to four helium light bands, carried on a nitrile rubber bellows. The bellows pre-load keeps the faces mated while absorbing propeller thrust, misalignment and vibration. It's completely dripless, covers shafts from 3/4" to 3-3/4" (20–95 mm), and is one of the most widely fitted dripless seals worldwide.

Tides Marine SureSeal

The SureSeal is a self-aligning nitrile lip seal — the lip rides on the propeller shaft — combined with a water-lubricated PTFE alignment bearing. Its signature feature is a genuine advantage: an optional Spare Seal Carrier parked on the shaft lets a worn lip seal be swapped without hauling out. The structural trade-off of any lip design applies: the lip bears directly on the shaft.

Glide (GMSS and Glide Ultra)

Glide builds a proprietary double-lip seal in a GLIDE-400 composite housing with no mechanical components. Glide markets it as tolerant of running dry, and it's widely fitted in the US ski and wakeboard inboard market. As with all lip designs, the lips ride on the shaft.

Lasdrop Gen II

The Lasdrop Gen II is the closest peer to PSS: a mechanical face seal with a carbon face and a rotating seal ring. Instead of a rubber bellows it uses a spring-loaded pressure housing, and it integrates a water-lubricated bearing. Its no-bellows service argument is legitimate — no bellows means no bellows to age — and it deserves a fair hearing from anyone comparing face seals.

Volvo Penta

Volvo Penta supplies a rubber lip-type shaft seal for its own installations. It's a straightforward lip design: the lip rides on the shaft.

The stuffing box baseline

The traditional stuffing box every dripless seal replaces packs flax around the shaft. It's designed to drip, needs periodic tightening and repacking, and the shaft wears under the packing.

Shaft seal comparison at a glance

Which dripless shaft seal brand should you choose?

Honestly: any of these seals will keep the bilge dry when it's sized and serviced right. Tides' in-water seal swap is a real advantage for boats that are hard to haul. Lasdrop's no-bellows argument is fair. Glide has earned its place in the ski and wake market.

Our pick is the PSS Type A — the brand we stock and the seal this store is built around. Sizing takes two measurements, shaft diameter and stern-tube OD, and the seal finder shows every match with live stock and prices. Weighing the standard seal against the silicone-bellows PSS PRO? Our Type A vs PRO comparison covers the differences.

Dripless shaft seal brand FAQs

Which brands make dripless shaft seals?

The names most boat owners meet are PSS (made by PYI Inc in the USA), Tides Marine with the SureSeal, Glide with the GMSS and Glide Ultra, Lasdrop with the Gen II, and Volvo Penta, which supplies a lip-type seal for its own installations. PSS and Lasdrop are mechanical face seals; the others are lip seals.

What is the difference between a lip seal and a face seal?

In a lip seal, a rubber lip rides directly on the propeller shaft, so the shaft is part of the sealing interface. In a face seal such as the PSS Type A, a stainless rotor and a carbon flange seal against each other — the sealing surfaces are off the shaft entirely.

Can I swap dripless shaft seal brands at refit?

Usually, yes — a refit is the natural time to change brands. A PSS Type A is sized from two measurements: shaft diameter and stern-tube outside diameter. Take both, and our seal finder will show every PSS Type A that fits, with live stock and prices.

Why do you stock PSS?

We're Luxfords Marine, an authorised Australian PSS distributor trading since 1963. We chose the PSS Type A because its face-seal design means the shaft is not a wearing part, it's one of the most widely fitted dripless seals worldwide, and we can back every seal with genuine parts and local support.