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.

Custom 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.

Air Seal Ring feature allows re-packing at sea without dry-docking.

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
Air Seal Replacement Instructions

		Johnson Heavy-Duty Stuffing Box Brochure

Duramax^® is a registered trademark of Duramax Marine^® LLC. Johnson^® is a registered trademark of Duramax Marine^® LLC. Ultra-X^® is a registered trademark of Duramax Marine^® LLC.