An article comprising a can having opposing top and bottom ends with a valve stem extending out from the top end and a dispensing device attached to the valve stem, wherein the dispensing device comprises: a. a hollow base with opposing entrance and exit ends and defining a hollow base flow channel extending all the way through the base including through the entrance and exit ends with the entrance end removably attached to the valve stem of the can so as to provide fluid communication from the valve stem into the hollow base flow channel of the hollow base; b. a hollow tube with opposing entrance and exit ends and defining a hollow tube flow channel extending all the way through the hollow tube including through the entrance end and through one or more than one hole proximate to the exit end, wherein the hollow tube is affixed to the hollow base so that the entrance end of the hollow tube is proximate to the exit end of the hollow base so as to establish fluid communication between the hollow base flow channel and hollow tube flow channel and so the two flow channels become continuous; c. a sleeve with opposing lower and dispensing ends and a finger pad proximate to the lower end, wherein the sleeve extends over and is able to slide over at least a portion of the hollow tube such that the dispensing end of the sleeve is proximate to the exit end of the hollow tube and wherein the sleeve defines a dispensing hole proximate to the dispensing end; d. an elastic connector that attaches the sleeve to at least one of the hollow base and hollow tube proximate to the lower end of the sleeve such that when the sleeve slides along the hollow tube away from the hollow base the elastic connector provides a restoring force to slide the sleeve along the hollow tube back towards the hollow base; and e. a sealing gasket around the outside of the hollow tube between the hollow tube and sleeve and located between hole or holes proximate to the exit end of the hollow tube and the entrance end of the hollow tube; wherein the dispensing device can reversibly move between an open position and a closed position by sliding the sleeve along the hollow tube, the closed position having the sleeve sealing the one or more than one hole in the hollow tube proximate to the exit end of the hollow tube and the open position being achieved by sliding the sleeve from the closed position along the hollow tube away from the hollow base so as to unseal the one or more than one hole through the hollow tube allowing fluid flow from the hollow tube flow channel out from the sleeve proximate to the dispensing end; and wherein a single action of pressing a finger against the finger pad is able to slide the sleeve to an open position and to tilt the valve stem to dispense pressurized contents of the can through the hollow tube and wherein subsequent single finger action of releasing pressure on the finger pad results in both return of the valve stem to a closed position for the can and return of the sleeve to a closed position. a. a hollow base with opposing entrance and exit ends and defining a hollow base flow channel extending all the way through the base including through the entrance and exit ends with the entrance end removably attached to the valve stem of the can so as to provide fluid communication from the valve stem into the hollow base flow channel of the hollow base; b. a hollow tube with opposing entrance and exit ends and defining a hollow tube flow channel extending all the way through the hollow tube including through the entrance end and through one or more than one hole proximate to the exit end, wherein the hollow tube is affixed to the hollow base so that the entrance end of the hollow tube is proximate to the exit end of the hollow base so as to establish fluid communication between the hollow base flow channel and hollow tube flow channel and so the two flow channels become continuous; c. a sleeve with opposing lower and dispensing ends and a finger pad proximate to the lower end, wherein the sleeve extends over and is able to slide over at least a portion of the hollow tube such that the dispensing end of the sleeve is proximate to the exit end of the hollow tube and wherein the sleeve defines a dispensing hole proximate to the dispensing end; d. an elastic connector that attaches the sleeve to at least one of the hollow base and hollow tube proximate to the lower end of the sleeve such that when the sleeve slides along the hollow tube away from the hollow base the elastic connector provides a restoring force to slide the sleeve along the hollow tube back towards the hollow base; and e. a sealing gasket around the outside of the hollow tube between the hollow tube and sleeve and located between hole or holes proximate to the exit end of the hollow tube and the entrance end of the hollow tube;