Abstract: A drywall compound dispensing system is provided by applying drywall compound to a wallboard having a delivery tube for delivering drywall compound entirely therethrough provided with a supply end connected to a source of pressurized drywall compound, and a dispenser end opposite to the supply end connected for pivotal movement with a drywall compound dispensing head. A tandem control lever arrangement is located at the supply end of the delivery tube and is engaged by one hand of the user for optionally providing manual and automatic, continuous flow of drywall compound through the delivery tube, and disabling pivotal movement of the dispensing head.

Abstract: An apparatus is provided for permitting a substantially continuous flow of drywall compound to a wallboard joint. The apparatus includes a delivery tube for delivering drywall compound completely therethrough. The delivery tube has a first end connected to a drywall compound supply assembly fed directly by a source of pressurized drywall compound. The delivery tube also has a second end opposite the first end in communication with a drywall compound dispensing head. A normally closed, pressure sensitive valve arrangement is interposed between the second end of the delivery tube and the dispensing head for controlling the starting and stopping of drywall compound flow between the delivery tube and the dispensing head.