The Series 500-E diaPump enables users of packed piston pumps to cost-effectively upgrade to a true hydraulic diaphragm pump, which eliminate the need for greasing and replacement of the packing and do not leak. The 500-E pumps feature the company's unique Variable Oil Bypass stroke adjustment, which improves valve performance over variable linkage designs.

Neptune Chemical Pump Co. Inc.
Lansdale, Pa.
(215) 699-8700
www.neptune1.com