Disclosed is an all-plastic spray gun, including a housing. The housing is connected to a gun body, a front end of the gun body is connected to a header cap, the header cap is connected to a water division head body, the water division head body is inserted into the gun body, the gun body is hinged to a trigger, the trigger is connected to a piston, the piston is slidably connected to a negative pressure column of the gun body, an upper end of the negative pressure column is provided with a plastic spring, the plastic spring is sleeved outside the gun body, a bottom end of the gun body is connected to a blank cap, the blank cap is connected to a large ring, a perforative suction tube is inserted into the blank cap.

A dispenser for pasty products having a fixed head that has a dispensing duct for dispensing a product, a pump with an elastically deformable cap, a manually-operated actuator, a separating wall with a suction inlet, and a suction valve cooperating with the suction inlet. The suction valve has a valve body and a plurality of tabs that bend and open the suction inlet in a product suction step, and close the suction inlet in a product dispensing step.

Disclosed is an upside-down sprayer with an auxiliary air conducting device for liquid pumping, including a container, a nozzle, and a dip tube equipped with a switching valve near its upper end, which has a valve casing, a valve ball, and an inverted liquid pumping port. An auxiliary air conducting device is disposed adjacent to the switching valve and includes a connection part, a guide seat, and a projecting tube with an opening, wherein the connection part is positioned on the dip tube, the guide seat has a groove, and the projecting tube communicates with the groove. The opening of the projecting tube is offset in the direction of the inverted liquid pumping port, and the height of the opening is not lower than the height of the inverted liquid pumping port when used inverted.