A coupler-aspirator-nozzle is formed in one piece. Coupling means are provided for coupling to a propellant cartridge and a separate product container. The coupling means communicate with first and second flow passages which in turn communicate with a mixing chamber. The mixing chamber then communicates with a nozzle opening. Flow of the propellant through the mixing chamber aspirates the product through the second flow passage and into the mixing chamber. The product is mixed with the propellant in the mixing chamber and then is sprayed through the nozzle opening. An indexing guide is provided to prevent the coupleraspirator-nozzle from becoming disoriented.