Abstract: A bag opener and dispenser device for emptying quantities of dry pourable material from bags which are hoisted above reactor vessels. The device has a funnel-shaped side wall with a lower annular surface adapted to be mounted to a manway opening leading to the reactor vessel. An apparatus centered within the funnel has an upwardly pointing hollow tip for piercing the bag. The device further includes a horizontal dust containment plate on which the bag is supported. The bag is lowered over the tip which cuts a flap in the bottom of the bag for pourable material to fall through the tip and also through a surrounding region covered with a mesh. In order to facilitate egress of the pourable material from the bag, elongated holes are formed in the side wall of the hollow tip. The dust containment plate sealingly mates with the sides of the bag to prevent the formation of dust.