Abstract: A convenient and efficient paint tank which utilizes water pressure as the pressure means for dispensing paint from the tank through the application device. More specifically a paint tank having an upper and lower chamber separated by a flexible diaphram. Paint and the like is introduced into the upper chamber by way of an access port and water is introduced into the lower chamber by a hose. The water induces a pressure against the diaphram forcing the paint out of the upper chamber and through a valve to the application device. Further, a way of introducing water into the upper chamber is also provided such that the tank will clean itself when the paint has been removed.