Cut the FlexiGas tubing using a wheel metal pipe cutter. Ensure the cut is centered in the valley between the corrugations and the cutter is only slightly tightened on each full revolution around the tube. Make sure that the cut is clean and circular with no sharp metal edges. 

With a utility knife safely remove the flame retardant yellow cover so that the last four corrugations are exposed. 


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Slide the nut over the tubing and then place the two semi-circular collets around the tubing so that the ridges on the collets occupy the last three valleys of the tubing.

Ensure that one full corrugation is in front of the leading edge of the collets as shown in the above diagram. This corrugation will compress and flatten against the copper seat as the fitting is tightened. 

*sometimes if the tube has been curved while installing, the collets may not hug the tubing as designed - very gently press the collets together using a pair of multi-grips while being careful not to deform the shape of the collets


Make sure that the copper ring is in place on the seat inside the fitting before inserting the collets into the fittings (free replacement rings are available).

Tighten the nut and fitting using two suitably sized wrenches. The seal is formed when the last corrugation deforms around the copper seat inside the fittings. Make sure sufficient torque is applied to properly compress the last corrugation.  


After conducting a gas tightness test, wrap the small gap between the "tail" on the nut and tube using yellow silicone tape. 





All installations must be made in conjunction with the FlexiGAS installation manual (available from the “Technical Downloads” tab) and any relevant EN Standard, in particular BS 6891. 


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