Spray gun with disposable liquid handling portion

A disposable container and spray nozzle assembly for spraying liquid onto a surface when the assembly is attached to a source of air under greater than atmospheric pressure, said assembly comprising:

• a tube having a through opening, an outlet end portion, an inlet end portion, and a sealing portion between said inlet and outlet end portions;
• at least one sheet of tough flexible material having portions attached together and to said sealing portion of said tube to form a bag like container defining an internal chamber with the inlet end portion of said tube within said chamber and the outlet end portion of said tube outside of said chamber, said at least one sheet having portions attached together along a line of temporary attachment to separate said chamber into first and second parts;
• a liquid in said second part of said chamber;
• tubing means in said chamber coupled to said inlet portion of said tube and adapted for contact with liquid;
• a nozzle having a liquid inlet port connected to said outlet portion of said tube with said through opening in said tube communicating with said liquid inlet port, an air inlet port adapted to be coupled to the source of air under pressure, a spray tip portion having an outlet opening, a through opening communicating between said outlet opening and said liquid and air inlet ports, and means for forming a vacuum at the liquid inlet port upon movement of air into said air inlet port and out said outlet opening in said spray tip portion so that atmospheric pressure will bias liquid in said chamber into said liquid inlet port to be entrained in air passing through said through opening of said nozzle and out of said outlet opening, and
• a vent in said first part for communicating said chamber with the atmosphere.