Johnson Heavy-Duty Stuffing Box Is Engineered
For Optimum Performance
and Easy Maintenance.
A Johnson heavy-duty stuffing box is engineered and built
to seal out seawater and give unmatched protection for your
propulsion system. Its robust construction, highest quality
alloys and precision machining gives it the ability to withstand
long service life at sea. It’s not uncommon for a Johnson
Heavy-Duty Stuffing Box to last the life of the vessel.
built to fit your vessel
Heavy-duty stuffing box is manufactured
from the highest quality bronze as standard,
or aluminum to match your specific application.
Service options available: Air Seal,
water service, grease service and lantern ring
with “zerk” fitting, or a combination of the
three service options
For shaft sizes as
small as 2.5 inches up to a maximum of 36 inches.
All assemblies are pressure tested to assure
the integrity of your system.
Seal Ring feature allows re-packing at sea without
The ship’s engineer can simply inflate the Air
Seal rubber ring to 15 psi, making journal contact,
creating a water-tight seal that holds out seawater
during packing change.
“Positive Retraction” permits repeated inflation-deflation
cycles without damaging shaft.
When repacking is complete, the Air Seal Ring is deflated.
The rubber ring retracts to its original concave configuration
in the housing, away from the journal. The rubber remains
perfectly smooth so no damage is caused to shaft.
Air Seal ring in original concave configuration
Air Seal ring inflates,
forming water-tight seal during re-packing
Stuffing Box Brochure
Custom Engineered Castings
Split design units
Stuffing boxes larger than
15” only come in spilt design. Any size and model can be
Dutchman Air Seal
Dutchman adds unique Air Seal Ring to any split design
or solid unit.
About Dutchman Air Seal
Use Duramax Ultra-X
High Performance Compression
With Johnson Duramax Stuffing Box.
Engineered specifically for marine propulsion
Lasts 5X longer than
300% lower friction than flax
Superior thermal conductivity
Virtually eliminates shaft scoring
Transfers friction heat away
About Ultra-X Packing
Duramax® is a registered trademark of Duramax Marine® LLC. Johnson® is a registered trademark of Duramax Marine® LLC.
Ultra-X™ is a trademark of Duramax Marine® LLC.