Trigger pump sprayer

A trigger sprayer comprising a body having an upper generally horizontally extending portion and a lower generally vertically extending portion, said body having passage means therein extending from one end of said upper portion to the bottom of said lower portion for providing a fluid flow path through said body, a first cylindrical cavity extending into said lower body portion from the underside thereof, an insert member adapted to be received in said first cavity and having a passageway therethrough communicating with said body passage means, means for coupling the lower end of said insert member to a container of fluid, a check valve assembly associated with said passageway including lower check valve means for permitting fluid flow upwardly therethrough from the container to which said insert member is coupled, and upper check valve means for permitting fluid flow upwardly through said passage means to said one end of said upper body portion, and pumping means mounted to said body and communicating with said passageway between said upper and lower check valve means, said lower body portion having a second generally cylindrical cavity therein, said body insert member having second passage means therethrough communicating the interior of said second cylindrical cavity with said passageway and said insert member, and said pumping means comprising a piston received in said second cavity, a spring in said second cavity between an inner end thereof and an inner end of said piston for biasing said piston outwardly of said second cavity, and trigger means which are pivotally connected to said body and engagable with an outer end of said piston and which are hand manipulatable for pushing said piston into said second cavity against the action of said spring thereby to force fluid in said second cavity, on an inner stroke of said piston, from said second cavity into said passageway and past said upper check valve means to said one end of said upper body portion, and on an outer stroke of said piston, to draw fluid into said second cavity from the container through said lower check valve means.