An air seeder includes a product tank having an interior, an air lock in communication with the product tank interior, a plurality of product boots, a pneumatic distribution system, and a plurality of diverter assemblies. The pneumatic distribution system includes an air source and a plurality of distribution lines. The air source is in communication with the product tank interior. Each distribution line is fluidly coupled with at least one corresponding product boot. Each diverter assembly includes an inlet coupled with the air source, a first outlet coupled with at least one distribution line, a second outlet in communication with the air lock, and a diverter for selectively diverting air and entrained product from the inlet to the first outlet or the second outlet.