Abstract: A relatively inexpensive and easy to operate plural component dispensing apparatus is made up of one or more double sided pumps, such as an air-operated double diaphragm pump. The manifolding on the pumps is divided so that each side of the pump pumps one of the components of the plural component material with an integrator (18) attached to the outputs of the two sides to bring the out-of-phase output of the pump into phase. Diaphragm type isolation valves (116) are optionally provided on the output of each side of the pump in order to prevent back flow of mixed material. In the event that ratios other than 1:1 are required, more than one such pump may be used together in order to result in a variety of ratios.