Abstract: A fluid spray device comprising an outlet channel (120) terminating in a spray orifice (125), a first tank (110) containing a first substance, a second tank (210) containing a second substance, said two tanks (110, 210) being interconnected by a passage (160, 260) and prior to actuation of the device, being separated from each other in leakproof manner by sealing means (115, 215) disposed in said passage (160, 260), mixer means (130, 135; 235) being provided to open said passage (160, 260) and to mix together the two substances before they are dispensed, and dispenser means (235, 135) being provided for dispensing said mixture, the device being characterized in that said sealing means comprise at least one ball (115, 215) adapted to be expelled from the passage (160, 260) by said mixer means (130, 135; 235), said mixer means comprising a first piston (135; 235) slidably received in one of the tanks (110; 210) to transfer one of the substances from its tank (110; 210) into the other tank (210; 110), said dispe

Abstract: This invention relates to a reservoir (10) for a fluid product containing a single dose, the reservoir (10) comprising an air inlet (11) and a product outlet (15), the air inlet (11) comprising a product retention device (12 and/or 13) to keep the product in the reservoir (10) until dispensation of the product, and the product outlet (15) being blocked, preferably in a sealed fashion, by a closing ball (16) which is removed from its blocking position by the flow of air when the product is being dispensed. This invention also relates to the method of filling the reservoir and a dispensing device for the product contained in the reservoir using an air blast (20).