Pressure retaining valve for an air spring, the pressure retaining valve comprising: - a first valve body for placement in an opening of an air spring, the first valve body having an access opening being connectable in fluid communication to a conduit; - a second valve body connected to the first valve body, the second valve body comprising a chamber being connected in fluid communication to the access opening and having at least one lateral outlet opening being connectable in fluid communication to an air spring; - a return element for providing a bias in the direction of the access opening, the return element being arranged outside the access opening in the chamber; - a closure member disposed in the chamber; the closure member being movable against the bias from a closed state in which the access opening is closed to an open state in which the access opening is open; and - an actuator member having a head portion, a shaft portion extending away from the head portion, and at least one flow passage extending from the head portion at least partially along the shaft portion, the head portion being disposed on a side of the access opening facing away from the chamber outside the access opening and having a larger diameter than the access opening, said stem portion being movably disposed into said chamber through said access opening, and said actuator member being adapted to move said closure member from said closed state when a force acting on said head portion against said bias is greater than said bias, moves the actuator member with the stem portion out of the access opening into the chamber, the head portion having at least one conduit contact surface for abutting a conduit end portion forming a partial surface of a ring, the ring having a larger diameter than the access opening, and the pressure retaining valve having an anti-loss device for the actuator member, configured to restrict movement of the stem portion in the access opening away from the chamber, characterised in that the anti-loss device comprises at least a first snap-hook member disposed at the access opening and at least a second snap-hook member disposed at the stem portion. - a first valve body for placement in an opening of an air spring, the first valve body having an access opening being connectable in fluid communication to a conduit; - a second valve body connected to the first valve body, the second valve body comprising a chamber being connected in fluid communication to the access opening and having at least one lateral outlet opening being connectable in fluid communication to an air spring; - a return element for providing a bias in the direction of the access opening, the return element being arranged outside the access opening in the chamber; - a closure member disposed in the chamber; the closure member being movable against the bias from a closed state in which the access opening is closed to an open state in which the access opening is open; and - an actuator member having a head portion, a shaft portion extending away from the head portion, and at least one flow passage extending from the head portion at least partially along the shaft portion, the head portion being disposed on a side of the access opening facing away from the chamber outside the access opening and having a larger diameter than the access opening, said stem portion being movably disposed into said chamber through said access opening, and said actuator member being adapted to move said closure member from said closed state when a force acting on said head portion against said bias is greater than said bias, moves the actuator member with the stem portion out of the access opening into the chamber, the head portion having at least one conduit contact surface for abutting a conduit end portion forming a partial surface of a ring, the ring having a larger diameter than the access opening, and the pressure retaining valve having an anti-loss device for the actuator member, configured to restrict movement of the stem portion in the access opening away from the chamber, characterised in that the anti-loss device comprises at least a first snap-hook member disposed at the access opening and at least a second snap-hook member disposed at the stem portion.