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Additional O-Rings

Our standard KB Duct O-ring is Buna-N–40 durometer rubber.  This o-ring is resistant to many chemicals and oils with a temperature rating up to 250⁰. Other materials such as Red Silicone and Viton are also available.

One (1) O-Ring is supplied with each adjustable sleeve. Additional O-Rings may be needed for the infinite adjustability feature of KB Duct clamp fittings, such as elbows, branches, reducers, etc.


  • Closed cell material – impervious to many chemicals and oils – good compression- excellent resiliency – low cost.
  • Temp range: -67F to 275F


  • FDA approved – Closed Cell – moderately priced
  • Temp range: -103F to 475F


  • Highly resistant to many chemicals and gases – very inert – premium price
  • Temp Range: -4F to 435F

Call for compatibility and pricing for your application needs.



  • Low Total Cost of Ownership
  • High reliability with custom manufactured designs to fit your application needs



  • Material integrity – Premium quality materials for even the most abrasive applications


KB Duct O-Rings

At KB Duct, our quality ducting systems give you options for every situation and provide unmatched attention to detail and flexibility. We offer custom development for special projects: Give us your ideas and we will bring them to reality! Our free 3D design service turns your preliminary ideas into a fully conceptualized, graphic duct solution that we will build and deliver to your facility. We have the fastest delivery in the industry. Need the right solution right away? Turn to KB Duct! 

KB Duct understands your investment in your company and carefully crafts the right equipment for your needs.  We provide the largest selection of ducting components and application-specific duct solutions for dust and air handling on any scale. Regardless of where you are, we build, deliver, and install it for you. Our investment in your satisfaction doesn’t end when the product is delivered. Even after it is installed, if any issues arise, KB Duct will take care of them and let you rest easy. We are always committed to our products and to the people that use them. Trust KB Duct.