Fitting, a method for connecting corrugated tubing to a fitting and use of a fitting

A fitting for use with corrugated tubing having a series of peaks and valleys, said fitting comprising,

• a nut having a passage therethrough for receiving said tubing,
• at least one retainer arranged in said nut, said retainer having a retainer sealing surface for placement in a valley of said corrugated tubing, and a body having a pointy annular body sealing edge arranged so that the apex of said body sealing edge is pressed against said retainer sealing surface when said nut and said body are forced towards each other;
• wherein said retainer sealing surface is concave and curved;
• wherein said retainer sealing surface is positioned opposite said pointy annular body sealing edge, said retainer sealing surface and said pointy annular body sealing edge configured to compress corrugated tubing therebetween;
• wherein said pointy annular body sealing edge is arranged to form a line seal at an end of said corrugated tubing;
• wherein said retainer is substantially symmetrical around a plane through the middle of said retainer, said plane being perpendicular to a longitudinal centre axis of said fitting;
• wherein said line seal is less than 3 mm wide;
• wherein the retainer sealing surface is curved and concave over the entire line seal;
• wherein said pointy annular body sealing edge is formed along the edge of two abutting body surfaces, a first of said two abutting body surfaces is substantially perpendicular to a longitudinal centre axis of said fitting, wherein a mutual angle between said surfaces is between 10° and less than 90°.