A fluid pumping apparatus and system including a double acting diaphragm pumping device in which each pumping component has a pair of spaced apart diaphragms defining a containment chamber and all exposed surfaces in the pumping chamber and the containment chamber are made of an inert plastic material,...http://www.google.com/patents/US5062770?utm_source=gb-gplus-sharePatent US5062770 - Fluid pumping apparatus and system with leak detection and containment
