An air seeder distribution apparatus has seed and fertilizer tanks, and a likeplurality ofmetering devices mounted on each product tank. A manifold set comprises a likeplurality of product manifolds and each manifold is separately fed from onemeteringdevice on each of the seed and fertilizer tanks. A control selectively startsand stopsrotation of the feed roller of each metering device to feed product fromeither tank, orboth tanks to the connected manifold. The weight of each tank can be displayedon aweight indicator. Balancing of the pressure in each supply conduit can beprovided. Aremote opener exerts downward force on the tank lid to maintain interiorpressure.
