Pressure-siphon switch for pneumatic spray gun

An apparatus for use with a paint container includes a nozzle and a housing. The nozzle receives paint from the container. The housing has a handle, an air inlet, and an air flow path configured to direct air from the inlet into the container. A valve body opens and closes the air flow path into the container upon moving back and forth between open and closed positions. The valve body moves between those positions by rotating about an axis without moving along the axis.