Garden trigger sprayers are well known in the art. Trigger nebulizers utilize hand-held reservoirs typically based on hand-operated pumps. The reservoir can hold any liquid desired to be sprayed in a stream, droplet, foam or mist. The liquid may include air fresheners, fabric fresheners, hair sprays, cleansers, and the like. The pump is actuated by a hinged trigger. The user squeezes the trigger by hand, typically retracting the trigger from the forward rest position to the rearward dispensing position. Movement of the trigger causes the liquid to be pumped out of the reservoir and eventually sprayed. Spray characteristics such as flow, droplets, mist are determined by a number of parameters and operating characteristics of the pump. For example, nozzle geometry, piston size, piston stroke, and pump efficiency all affect spray characteristics. The situation is more complicated if a pump designed for one specific liquid is used for a different liquid. Liquid rheological properties, surface tension, etc. also affect spray properties. The user's actions can make the situation more complicated. The pump can be designed and intended for a full trigger stroke, each stroke distributing the full volume of piston displacement at a particular stroke speed. However, consumers may not always or always operate triggers as expected. If the piston bore is too large, the force required to obtain the proper trigger stroke may be too great for a particular user.

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