Spray bar assembly

A spray gun subassembly comprising, in combination:

• a spray gun subassembly constructed and arranged to be received in a spray gun receptacle having a solution inlet conduit and an atomizing air conduit;
• the spray gun having a body portion adapted to fit in the receptacle and an insertion portion having a sealable orifice at a spraying end thereof,
• the body portion having an internal void constructed and arranged to be in fluid communication with the solution inlet conduit and the atomizing air conduit when the spray gun is positioned in the spray gun receptacle and the insertion portion is in an open position;
• the insertion portion being moveable between an open position defining a passage between the body portion void and the spraying end orifice a closed position sealing the insertion portion against the body portion to close said passage;
• the spray gun further having a piston received in the body portion, the piston operatively associated with the insertion portion to effect movement of the insertion portion between the open and closed position;
• the insertion portion being biased to the closed position;
• and
• the spray bar further having a piston air supply conduit, the piston air supply conduit being in fluid communication with the piston when the spray gun is positioned in the spray gun receptacle, whereby air is provided through the piston air supply conduit at sufficient pressure to move the insertion portion from the closed position to the open position.