Automatic larvicide dispenser

An automatic larvicide pump dispenser comprising:

• container means for holding liquid larvicide;
• a discharge port connected to said container means;
• a sealed cylinder disposed within said container;
• a piston reciprocally disposed within said cylinder and being sealed at the edges thereof against the inside of said cylinder, said piston being movable between a first and second reciprocal position within said cylinder;
• means for biasing said piston to a first position within said cylinder;
• first conduit means for communicating the supply of liquid larvicide in said container means with said cylinder;
• a first one-way valve means disposed within said first conduit means for permitting flow of liquid to flow from the container means to said cylinder when said piston is moved from the second position to the first position thereof, and preventing flow through said first conduit means at all other times;
• second conduit means for communicating the inside of said cylinder with said discharge port;
• a second one-way valve means disposed in said second conduit means for permitting flow from said cylinder to said discharge port when said piston is moved from the first to the second position thereof and preventing flow of liquid through said second conduit means at all other times;
• a piston rod connected to said piston and extending out of said cylinder and out of said container means;
• and
• actuator means operably connected to said piston rod and to said container means which lengthens when it becomes wet and shortens when it becomes dry whereby said piston will be pushed to said first position by said biasing means when said actuator means is wet and whereby said piston will be pushed to said second position thereof, against the force of the biasing means, as said actuator means becomes dry.