Constant Pressure System

Due to the nature of the bladder, the stream produced is fairly constant, and has almost the same range and power throughout the entire shot, most streams dropping only one foot in range towards the end of a continuous shot, unlike most air pressure based water guns which exhibit a constant loss of pressure while the trigger is pulled.

The Constant Pressure System was used for the first time when Larami Toys released the Super Soaker CPS 2000 in 1996.

To this day, the first generation CPS 2000 is the most powerful production water gun, with an output of 30 oz.

These included the Aquapack Devastator, the Flash Flood, the Arctic Blast, the Hydroblitz, and the Hydro Cannon.

[1] In 2020, German outdoor company Spyra GmbH launched its own CPS-based line of electric water guns marketed under the same name.

Comparison of simple (A), air pressurised reservoir (B), air separate pressure chamber (C) and Constant Pressure System (D) water guns:
In (A), pushing the trigger (1) expels the cylinder's contents through the nozzle; releasing it refills it from the reservoir (2).
In (B), pumping the piston (3) forces air into the reservoir (4), increasing its pressure; opening the valve (5) expels the reservoir's contents.
In (C), pulling out the piston (6) draws in water from the unpressurised reservoir (7), whereas pushing it in pressurises the firing chamber (8); triggering the valve (9) expels the chamber's contents.
In (D), the firing chamber is replaced with an elastic bladder (8a) which exerts more uniform pressure on the water.