Water Gun 07
Water Gun 07 : Types: (6) Air Separate Pressure / Firing Chamber: The air-based separate pressure chamber or firing chamber system works on the same physical principle as the pressurized reservoir system, but instead of pressurizing the reservoir, a separate, fixed volume chamber is included on the water gun into which water is pumped, compressing the air inside. This technology was first used on the Super Soaker SS 100. This allows the reservoir to be removed/opened at any time for refilling since the reservoir is not pressurized. As well, the typically smaller size of the pressure chamber and the fact that water is typically pumped, as opposed to air, reduces the average number of pumps needed to achieve functional pressure. For improved performance, some users opt to pre-pressurize the firing chamber by pumping in some air first. This increases the starting pressure within the chamber, thus increasing the overall average pressure experienced by the water when it is pumped into the pressure chamber
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