Inpro/Seal is the originator of bearing isolator technology and a global leader in custom engineered system and bearing protection.

Inpro/Seal is the world leader in the design and manufacture of permanent bearing protection and complete shaft seals for rotating equipment. Since inventing the original Bearing Isolator in 1977 Inpro/Seal has maintained a leadership position in the niche markets they serve.

Inpro/Seal’s unique product lines increase MTBR and decrease downtime on multiple applications operating in a variety of industries. With over 30 years of knowledge and real world experience, our custom engineered solutions, same day shipments and localized sales force will provide you with the right technology, right when you need it.

Inpro/Seal is part of Waukesha Bearings Corporation™, a world leader in hydrodynamic bearings and magnetic bearing systems, and an operating company of Dover Corporation (NYSE: DOV). Headquartered in Rock Island, IL, USA Inpro/Seal has manufacturing facilities in North America and Europe and sales offices in North America, Europe, Asia, Russia and the Middle .

Inpro/seal Products

Bearing Isolator:

As the inventor of the original Bearing Isolator, Inpro/Seal continues to be a leading provider of permanent bearing protection for a variety of applications. No matter the size or complexity of the application, Inpro/Seal’s technical experts can design a custom solution for your equipment.

Bearing failures lead to expensive downtime and lost production. With Inpro/Seal Bearing Isolators you can reduce maintenance costs and double the lifetime of your rotating equipment.

The Inpro/Seal Bearing Isolator is a two part dynamic seal consisting of a stator and a rotor attached to the shaft. The rotor and stator form a non-contacting compound labyrinth seal with no wearing parts – ensuring permanent protection. Multiple designs and custom engineering capabilities provide customers with the right solution for your application and operating environment.

The VB45-S Bearing Isolator is the new standard in Bearing Isolator Technology. This unique design provides IP66 rated contamination protection in a small 0.625 in. (15.88 mm) overall length. For more robust protection, the new VB45-U Bearing Isolator provides IP66 rated contamination protection and eliminates lubrication loss for both oil or grease lubricated equipment while also accommodating axial movement.


Patented bearing isolator design features protect in two ways. Here’s how…

  • Ubricant is captured in the inner portion of the labyrinth and flows back to the bearing housing. Lubricant is captured in the inner portion of the labyrinth and flows back to the bearing housing.
  • Outside contamination attempting to enter the bearing housing is captured in the outer labyrinth paths and expelled through a port in the rotor by centrifugal force and gravity.
  • Non-wearing, non-contacting, permanent bearing protection
  • Custom engineered for your specific application and operating environment
  • Split designs for ease of installation
  • Patented VBX Ring blocks moisture and condensation created by heating/cooling of bearing enclosures
  • Same day shipments available on most products, including new designs
  • Unconditional performance guarantee

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Sleeve Bearing

Steam Turbine



The Inpro/Seal Bearing Isolator is a unique barrier for contamination ingress and lubrication retention for bearings installed in pumps, motors, gearboxes, pillow blocks, steam turbines, sleeve-bearing motors, paper machine rolls, and many other types of rotating equipment.

No matter the size or complexity of your application, Inpro/Seal can design an isolator to fit your specifications.

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Air Mizer

Inpro/Seal AM (Air Mizer®) Solutions are complete non-contacting shaft seals designed to prevent product loss, harmful emissions, and contamination over the lifetime of your rotating equipment.

Product loss and contamination can be costly - resulting in downtime, unsafe working conditions, and maintenance nightmares. AM Solutions™ shaft seals use a positive purge of air, or inert gas, as the sealing medium to create an effective seal without any wearing contact surfaces.

Slow-speed, low-pressure applications challenge traditional shaft sealing methods. Only AM Solutions shaft seals fully articulate to accommodate radial run-out, axial movement, and angular misalignment simultaneously.

Inpro/Seal AM Solutions shaft seals offer a variety of designs and features to fit your specific applications and operating environments. These include:

  • AM Smooth Bore
  • AM Food Grade
  • AM Rotor

When installing AM Solutions shaft seal, the AM Control Panel offers the simplest and most efficient air system setup possible.

No Product Loss. No Harmful Emissions. No Contamination.

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Patented shaft seal design creates a barrier for powders, liquids and bulk solids. Here’s how…

  • Small amounts of air, or inert gas, create a positive purge against the shaft – permanently sealing against contamination and product loss.
  • Custom engineered for your specific application and operating environment
  • Completely non-contacting, non-wearing
  • Uses minimal air, or inert gas, consumption, energy efficient
  • Accommodates axial shaft movement and misalignment
  • Split designs for ease of installation
  • Multiple designs available to me the requirements of your application or operating environment
  • Seals for the lifetime of your equipment - no hassle with rebuild kits
  • Performance guarantee
  • Can be installed in conjunction with the AM Control Panel for the simplest and most efficient air system setup


Inpro/Seal AM (Air Mizer) Solutions shaft seals are custom engineered to provide an effective seal in a variety of challenging applications, including agitators, mixers, blenders, powder conveyors, pulpers, rotary valves and other product-handling equipment. 

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Shaft Grounding Solutions

Inpro/Seal Current Diverter Ring (CDR®) technology protects your motor bearings and coupled equipment from damaging electrical currents so you can maximize equipment reliability, reduce costly maintenance and minimize unscheduled downtime.

Variable Frequency Drives can create stray currents that run along the shaft and discharge through the motor bearings and bearings of coupled equipment — causing fusion craters, pitting, frosting and fluting. The Smart CDR grounds shaft currents that cause bearing damage and premature motor failure. On severe-duty applications, The Smart Motor Gounding Seal (MGS®) provides complete bearing protection against shaft currents, contamination ingress and lubrication loss,

For the next generation of shaft grounding, Smart Shaft Grounding, only from Inpro/Seal, combines proven technology with innovative new features, providing solutions to problems that limit other technologies.


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Proprietary design features protect against bearing damage. Here’s how...

  • The CDR® uses proprietary conductive carbon filaments to safely divert stray shaft currents to the ground - away from the bearings.
  • In addition to shaft grounding, the MGS® utilizes patented bearing isolator technology to keep contamination from entering the bearing housing – protecting your equipment
  • Custom engineered for your specific application and operating environment
  • Press-in, clip-on or flange-mounted installation
  • Split designs for easy installation
  • Same day shipments available on most products, including new designs


The Inpro/Seal Current Diverter Ring and Motor Grounding Seal are custom engineered to provide permanent bearing protection on electric motors and drives.

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Steam Turbine Floating Brush Seals

The Inpro/Seal Sentinel FBS extends maintenance intervals to 3-4 years over conventional carbon rings which normally last 6-12 months. Designed as a drop-in replacement for existing carbon rings, the Sentinel FBS eliminates costly casing modifications and rotor removal for seal installation.

The Sentinel FBS is comprised of densely packed and flexible metallic bristles that bend with changing clearances between rotating and stationary surfaces. The brush serves as the primary shaft seal while a carbon element provides face sealing in the turbine’s casing. This unique technology provides an extra layer of protection that slows down the natural wear of downstream carbon rings – reducing maintenance, downtime and steam loss. Self-centering and lightweight, the Inpro/Seal Sentinel FBS's compliant brush allows "wear-in" for an optimum fit, providing predictable steam leakage over an extended operating life compared to carbon rings.

Now available for multiple manufacturers, including Elliott (YR turbines), Turbodiesel, Terry, Coppus, Skinner, Worthington and Murray. Other designs are available upon request. For more information, contact your local Inpro/Seal Representative here.

As a drop-in replacement for carbon rings on process steam turbines, the Sentinel FBS only takes minutes to install. Check it out for yourself.

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Decrease Periodic Maintenance. Decrease Steam Leakage. Easy Installation.

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