A dispenser for a gaseous, gas borne or droplet substance contained in a source thereof, the dispenser including: a body (1) with a mouthpiece (2) a junction member in the body for the substance source and a breath actuable valve, (8) for controlling the release of the gas or liquid containing or comprising the substance, the valve comprising: a flexible tube for receiving the said gas or liquid, the tube extending from a valve inlet connected to the junction member and having a portion (21) which is kinkable for closure of the valve and movable to an open position in which the tube is un-kinked for opening of the valve and a member arranged for movement in the body by inhalation to un-kink the valve the tube being kinked to an obturating extent when the movable member is in a ready position and un-kinked when the movable member is moved on inhalation for release of the gas or liquid wherein: the movable member is or includes a flap (7) arranged in the body for action of breath on it on inhalation the junction member,the flexible tube and the movable flap are a single injection moulding of plastics material and the movable flap is pivotally connected to the junction member.Distributeur pour substance gazeuse, suspendue dans un gaz ou en forme de gouttelettes, et contenue dans sa source. Le distributeur comprend: un corps (1) avec un embout un élément daccouplement (2) dans le corps, destiné à la substance source et une soupape actionnée par la respiration (18) et destinée à commander la libération du gaz ou du liquide contenant ou comprenant la substance, la soupape comprenant un tube souple pour recevoir ledit gaz ou liquide, le tube sétendant depuis une entrée de soupape reliée à lélément daccouplement et possédant une partie (21) pliée de manière à permettre la fermeture de la soupape et pouvant se déplacer vers une position ouverte dans laquelle le tube est déplié pour rouvrir la soupape et un élément aménagé de manière à se déplacer dans le corps sous leffet d
