Product Brief

The Kerotest Zunt Insulating Joints are manufactured to ISO 9001 standards. This solid weld design is more economical and comes in a broader range than any previous insulating joint from Kerotest…from 1/2-inch to 120-inch and over, ANSI 150 to 2500. There is no assembly required and no maintenance.


  • Compact design
  • Low profile
  • Complete range of sizes and pressure classes
  • Each joint is internally lined with epoxy resin to effectively prevent bridging of the insulating gap
  • Weld preps are per API 5L (ANSI B16.25 available upon request)
  • All welding processes are in accordance with ASME VIII and IX
  • Manufactured to applicable ANSI, ASTM, ASME, AISI, API, IEC, and ISO standards
  • Each joint is factory tested to verify the mechanical integrity and electrical resistance to satisfy cathodic protection requirements
  • Manufactured to ISO 9001 quality standards
  • Epoxy coated
  • Eliminates electrical shorts and stops stray current in a pipeline system
  • Most economical and reliable method that can be used to cathodically protect a pipeline system
  • Can be installed above or below ground
  • Reduced installation time (just to welds), eliminates field assembly of bulky insulated flanges and bolted couplings
  • Long term electrical resistance does not depend on installers assembly of an insulation kit
  • Eliminates costly maintenance to field repair flange leaks and electrical shorts

Learn more about the high quality, ready inventory, quick turnaround, and competitive prices that are built into all Kerotest valves and equipment.

Product Details
Ordering Information
Installation Details
Zunt Company Profile
Insulating Joint Specification