A compressed gas cylinder valve seal comprising a top surface, a bottom surface and a circumferential skirt, a first concentric ridge on the top surface, a second concentric ridge on the top surface, a third concentric ridge on the bottom surface, a fourth concentric ridge on the bottom surface, a cylindrical center section extending upwardly and away from the top surface, the cylindrical center section having a cylindrical center section ridge, and a gas passageway extending completely through the seal for permitting the passage of liquid through the seal.