A push-button for a system for dispensing a product under pressure, the push-button includes an actuator body having an orifice for ejecting the product, a closing off valving element of the ejection orifice and a sleeve having a mounting well of the push-button on a feed tube for the product under pressure, the body being slidably mounted around the sleeve between a high position and a low position by forming between them a space for carrying the product from the mounting well to the orifice for ejecting the product, the valving element being mounted between the body and the sleeve by the intermediary of a device for reversible displacing of the valving element between a closing off position—respectively an ejection position—when the body is in high position—respectively in low position—, the push-button includes an elastic recalling of the body in high position.