An on-off controller, according to various aspects of the present invention, for controlling a pressurized fluid from a provided bottle, the bottle having a poppet valve biased in a closed position, wherein the pressurized fluid flows from the bottle when the poppet valve is open, the on-off controller includes a body, a seal, a rod, and a position mechanism. The body having a cavity, an inlet, an outlet, and a vent, the inlet and the outlet having continuous fluid communication with the cavity, the vent having sealable fluid communication with the cavity. The seal having a bore therethrough, the seal for sealing the vent. The a rod having a first end portion, a second end portion, and a middle portion between the first end portion and the second end portion, the middle portion having a groove therein, the rod positioned in the bore. The position mechanism that moves the rod to: close the vent and open the poppet valve, wherein the groove is positioned on a cavity side of the seal or a vent side of the seal but not both and the rod sealably contacts the seal, and the pressurized fluid enters the inlet; and open the vent and close the poppet valve, wherein at least a portion of the groove is positioned on the cavity side of the seal and at least a portion of the groove is positioned on a vent side of the seal, the rod does not sealably contact the seal at the groove, whereby the pressurized fluid exits through the groove to the atmosphere.