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                                                                            1.Squarely cut tubing, preferably with a tube cutter, and then deburr both inside and outside diameters as necessary. 2. Firmly insert tubing into the tool as far as possible.  3. Mark the tubing, as shown, with a pencil or FINE POINT marker utilizing low chloride ink.  4. Firmly insert the marked tubing into the Gyrolok® fitting to which it will be assembled. Finger-tighten the nut. The mark should NOT be visible at this point. If not visible, continue to step 5. If any part of the mark is visible above the Gyrolok® nut after only fingertightening, the tubing is either not properly seated within the fitting or a ferrule is missing. Disassemble and determine cause.  5. If the mark is not visible after finger-tightening, continue by following appropriate Gyrolok® assembly instructions for tubing O.D. and wall thickness. 
                                                                         
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