Abstract: The present invention relates to an apparatus for delivering a stream of liquid material under pressure. The apparatus includes a base having a motor mounted thereon. A diaphragm pump is mounted on the base and is connected to the motor by a drive assembly. The diaphragm pump has a reservoir tank connected to it. A circulatory system circulates a pump liquid between the pump and the reservoir tank. An air check valve is connected to the circulatory system to allow air to be introduced into the circulatory system when the liquid material is prevented from being pumped out of the diaphragm pump. A collapsible container support is mounted on the base. A liquid material container is removably mounted in the container support for storing a liquid material prior to delivery to the diaphragm pump.