A valve for an inflatable object, the valve comprising: a housing defining a gas passageway and including a sealing lip; a stem assembly mounted to the housing and movable relative to the housing between a closed configuration and an open configuration, the stem assembly comprising a stem including a shaft and a base, a retaining element mounted to the base, and a sealing element, having a first side and an opposite second side, mounted to the base and positioned between the retaining element at said first side and the base at said second side; and a biasing element biasing the stem assembly to the closed configuration, wherein when the stem assembly is in the closed configuration, the sealing element at said first side sealingly engages the sealing lip so the gas passageway is closed, and wherein when the stem assembly is in the open configuration, the sealing element is spaced-apart from the sealing lip so the gas passageway is open, the base of the stem includes multiple mounting studs (224, 226), wherein the sealing element and the retaining element are mounted to the mounting studs (226, 228), the stem is rotationally and axially positioned relative to the housing, such that the shaft is received in a shaft-receiving opening of the housing and locking ribs (228, 230) of the stem are received in locking-rib-receiving openings (178, 180) of the housing, characterized in that, the sealing element is mounted to the stem by insertion of the shaft of the stem through a shaft-receiving opening of the sealing element, insertion of the locking ribs (228, 230) of the stem through locking-rib-receiving openings (244b, 244c) of the sealing element, and insertion of the mounting studs (224, 226) of the stem through mounting stud receiving openings (245a, 245b) of the sealing element such that second surfaces (241b, 242b, 243b) of the sealing element engage a first side of the base of the stem. a housing defining a gas passageway and including a sealing lip; a stem assembly mounted to the housing and movable relative to the housing between a closed configuration and an open configuration, the stem assembly comprising a stem including a shaft and a base, a retaining element mounted to the base, and a sealing element, having a first side and an opposite second side, mounted to the base and positioned between the retaining element at said first side and the base at said second side; and a biasing element biasing the stem assembly to the closed configuration, wherein when the stem assembly is in the closed configuration, the sealing element at said first side sealingly engages the sealing lip so the gas passageway is closed, and wherein when the stem assembly is in the open configuration, the sealing element is spaced-apart from the sealing lip so the gas passageway is open, the base of the stem includes multiple mounting studs (224, 226), wherein the sealing element and the retaining element are mounted to the mounting studs (226, 228), the stem is rotationally and axially positioned relative to the housing, such that the shaft is received in a shaft-receiving opening of the housing and locking ribs (228, 230) of the stem are received in locking-rib-receiving openings (178, 180) of the housing, characterized in that, the sealing element is mounted to the stem by insertion of the shaft of the stem through a shaft-receiving opening of the sealing element, insertion of the locking ribs (228, 230) of the stem through locking-rib-receiving openings (244b, 244c) of the sealing element, and insertion of the mounting studs (224, 226) of the stem through mounting stud receiving openings (245a, 245b) of the sealing element such that second surfaces (241b, 242b, 243b) of the sealing element engage a first side of the base of the stem.