Abstract: Apparatus for mixing and dispensing at least two liquids, such as organic resins and polyisocyanates which react to form polyurethane foam, having a cylindrical mixing chamber positioned in the front end of a dispensing gun. The mixing chamber has exterior longitudinal gaskets intermediate its inlet ports so that the two liquids cannot migrate around the outside of the cylindrical mixing chamber. These gaskets extend into, and are held by, small passages in the annular shoulder on the interior facing end of the mixing chamber.

Abstract: The specific disclosure provides an automatic dispenser for periodically actuating a replaceable aerosol container to discharge a quantity of the contents of the container. The aerosol container includes a valve, means for biasing the valve to a closed position, an outwardly extending valve stem having an internal passage in fluid communication with the valve and a discharge outlet in fluid communication with the stem passage. The container discharges a quantity of the contents therein through the valve, the passage and the discharge outlet upon relative movement between the valve stem and the container against the biasing means.