knock out collars

Knock Out Collars & Plugs

Replacement Knockout 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.

For Use With Or Without The Included 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. 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