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  • API connections used where conditions or design requirements permit their use
  • API connections employ the DUOLINE TECHNOLOGY manufactured corrosion barrier ring (CBR), which has over 35 year history

API EUE 8-Round COnnection

  • New and Used Tubing can both be lined
  • Thread condition should meet API Standards
  • Driftability of used tubing is critical
  • End User selects used steel grade (EMI Color Code and/or hydrostatic testing requirements)
  • Packers and Accessories can also be lined

Sizes, Weights & Lengths Available in API connections

  • 2-1/16" 3.25 # IJ 10rd
  • 2-3/8" 4.7 # EUE 8rd & 4.6 # NU 10rd - 32.5’ max length
  • 2-7/8" 6.5 # EUE 8rd & 6.4 # NU 10rd -32.5’ max length
  • 3-1/2" 9.3 # EUE 8rd & 9.2 # NU 10rd - 32.5’ max length
  • 4-1/2" 12.75 EUE 8rd & 11.6 LTC*/STC* 8rd - 40.0’ max length
  • 5-1/2" 17 # & 20 # LTC*/STC* 8rd, Buttress - 43.5’ max length
  • 7" 23, 26, 29, 32 # LTC*/STC* 8rd, Buttress - 43.5’ max length
  • *LTC & STC casing threads have demonstrated limitations


For further information please use our General Enquiry Form or for product selection please complete the DUOLINE Selection Form.

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Click here to use the General Enquiry FormClick here to use the DUOLINE Selection Form