knock out collars

Knock Out Collars & Plugs

Knock out collars are used to balance fluid levels within the tubing strings. They allow for the releasing/non releasing of fluid within the string. A plug is just that, a plug within the K-O Collar. Our knock-out collars come with and without special stops. When a foreman would like to release fluids from the tubing string they will send a bar through the string that will punch the plug from the collar. Knock out collars with special stops allow you to catch the bar as it descends through the collar where as a Knock out without the special stop will allow the bar to shoot straight through the collar and further into the tubing string.


Sizes Available:

  • 2-3/8"
  • 2-7/8"
  • 3-1/2"


  • With and without special stops


  • Additional materials available upon request
Part No. Size
E904238DP 2 3/8"
E904238DPSPEC 2 3/8" w/ Special Stop
E904278DP 2 7/8"
E904278DPSPEC 2 7/8" w/ Special Stop
E904350DP 3 1/2"
E904350DPSPEC 3 1/2" w/ Special Stop

Dimensions are for reference only. Additional materials available upon request. Contact Global Elastomeric Products for details

Part No. Size
E904025KOP 1/4" Brass
E904075KOP 3/4" Brass
E904100KOP 1" Brass

Dimensions are for reference only. Contact Global Elastomeric Products for details