Pipe fitting

A pipe fitting, comprising:

• a main body portion formed with a connection opening into which is inserted a pipe provided with a ring-shaped projection at an outer periphery thereof;
• a retaining member attached to the main body portion so as to be capable of movement between a first position and a second position in a radial direction of the connection opening;
• a pair of leg portions that are provided at the retaining member and that jut out into the connection opening and engage a ring-shaped projection of an inserted pipe so as to prevent the pipe from being pulled out when the retaining member is in the first position;
• first tapered portions that are formed at front sides of the leg portions, and that make contact a ring-shaped projection of a pipe that is being inserted into the connection opening, deform the leg portions toward an outer side in the radial direction and allow the ring-shaped projection to pass by when the retaining member is in the first position;
• and
• second tapered portions that are formed at back sides of the leg portions, and that make contact a ring-shaped projection of a pipe that is being pulled out from the connection opening, deform the leg portions toward the outer side in the radial direction and allow the ring-shaped projection to pass when the retaining member is in the second position.