Plumbing fitting

A plumbing fitting comprising:

• an outer body having a flow path extending therethrough;
• an inner body disposed in, and axially movable along an axis relative to, the outer body;
• sealing means configured to prevent leakage of fluid from the plumbing fitting;
• the outer body or the inner body further comprising a track, the other of the outer body or the inner body further comprising a projection, the projection being movable in the track;
• wherein the track has at least a primary, outer, portion, a secondary, central, portion and a tertiary, outer, portion, and the angle of inclination of the secondary, central, portion is greater than the angle of inclination of the primary, outer, portion and of the tertiary, outer, portion, respectively, the angle of inclination being relative to the axis of axial movement;
• and wherein the plumbing fitting is movable between a first sealing configuration in which the projection is arranged in the primary, outer, portion, and a second sealing configuration in which the projection is arranged in the tertiary, outer, portion;
• wherein the inner body comprises an inlet aperture and an outlet aperture.