warren rupp pumps are manufactured in aluminum, cast iron, stainless steel, hastelloy, polypropylene, pvdf, nylon and conductive acetal. self-priming and seal less, they are ideal for pumping abrasive, semisolid, corrosive and shear sensitive materials. they are also chosen for applications where electricity is not available, or cannot be used due to safety conditions. diaphragm pumps provide pollution-free and energy-efficient operation, with fewer moving parts than conventional motor-driven pumps.