THE PROBLEM: Incorrect make-up is the #1 cause of fitting leakage.
THE SOLUTION: Superlok i-Fitting – the world’s first tube fitting with an integral gap gauge ensuring correct make-up without marking or manual gap gauge check.

Superlok i-Fittings



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  • No gap gauge required
  • No additional tools required
  • Reduced installation time
  • Prevents leakage due to incorrect make-up
  • Prevents Tube Stick.


The Superlok i-Fitting provides visual confirmation that a fitting is made-up correctly making it ideal for:

  • Critical Applications
  • Less experienced users
  • OEM Q.A. checks
  • Areas with limited accessibility


  • Maximum Working Pressure:
    Superlok tube fittings withstand pressures much higher than the tubing for which they are intended. Therefore, consult tubing manufacturers pressure tables for design guidelines.
  • Working Temperature Range:
    – 320°F to 1200°F (- 196°C to 649°C)

Need Assistance?

Get expert advise on our industry leading fittings

Difficulties in Installation Existing Tube Fittings

  • Correct 1-1/4 turn make-up is subjective.
  • Need Inspection Gap Gauge to assure fitting has been sufficiently pulled up.
  • Difficult to check with Inspection Gap Gauge in high or tight spaces. 

How it works:

  • The i-Fitting body has a red gap gauge, and a blue inspection ring.
  • When the fitting is correctly made up, the red gap gauge releases from the fitting and the blue inspection ring is revealed.
  • A blue ring means correct make up.
  • A red ring means insufficient make-up.
Superlok intergration Fitting Diagram

Superlok i-Fittings Range

i fittings cat 1
i fittings cat 2
i fittings cat 3


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