Product review (4 stars): Nice, compact, pressure actuated switch.
As one of the other reviewers stated, he received his as a Latching switch.  Although I also received my pressure switch configured as a "latching switch", I was able to reverse the toothed cylinder that causes it to latch and made it work as a momentary switch without much effort.  It doesn't take much volume or pressure to actuate either.  It is a common SPDT (com, NO, NC) micro switch snapped into a pressure actuated plunger assembly, with an inline ratchet type latching mechanism.  Just remove the snapped on cover and gently pry the sides apart to remove the micro switch.  Be careful as the two small ratchet mechanism pieces will fall out.  Simply put them back in, small rounded button with small arms first then the toothed cylinder with it's toothed end going in facing out toward the switch so it won't engage the buttons ratchet mechanism.  Viola!  Non-latching/momentary switch.