They’re not, though. They’re button-activated valves with a fairly complicated flow path, integrated screen, extremely high lifecycle, and pressure regulation t

They’re not, though. They’re button-activated valves with a fairly complicated flow path, integrated screen, extremely high lifecycle, and pressure regulation to deal with a wide range (one spec I saw said 30-90 psig) of water pressure, all while being contained in a single cartridge for easy replacement. The details of everyday items are fascinating.