Patent ID: 8882156

Claim:
A tube coupling to receive and hold a tube, the coupling comprising: a coupling body having a throughway open at one end to receive an end portion of tube; an annular step in the throughway facing the open end to provide an end stop for a tube; an annular seal located in the coupling body adjacent to the annular step, an end cap engaging the coupling body for axial movement between forward and retracted positions on the body; the end cap having an opening for the end portion of the tube to extend therethrough; a collet in the cap to allow insertion of the tube into the collet and having a plurality of legs with outer surfaces that engage with a tapered surface in the end cap which urges the legs inwardly to resist withdrawal of the tube; the seal being arranged to be compressed axially in response to forward movement of the end cap which causes a terminal end face of the tube when received within the coupling body to be pressed into sealing engagement with the seal; and a biasing member which provides a biasing force to urge the legs of the collet axially onto the tapered surface of the end cap when the cap is in the retracted position, wherein the tube can be received within the end cap, collet and biasing member when the end cap is in the retracted position and the plurality of legs of the collet securely engage the tube when the end cap is in the forward position.