| 摘要 |
A product container having a valve stem is coupled to the first of two flow passages in a coupler-aspirator. The flow passages join at a nozzle. The second flow passage communicates with a first chamber. A guide fits over and extends above the product container and has ridges on the interior thereof. Notched winged portions of the coupler-aspirator are retained on the ridges. A cylinder having a second chamber is coupled to the coupler-aspirator and positioned therebetween is a flexible annular gasket. A hollow valve stem having radial openings is mounted for movement within the chambers. The inner periphery of the gasket obturates the radial openings. A piston slides within the cylinder. Integral with the piston is an actuating member, and integral with the actuating member is a downwardly extending flange concentric around the piston. The bottom of the flange is beveled to mate with the beveled upper edges of the winged portions of the coupler-aspirator.
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