S Series screw pumps from Blackmer are available with or without external timing gears and bearings. The self-priming double-ended positive displacement pumps provide complete axial balancing of the rotating screws, and their timing technologies eliminate metal-to-metal contact with the pump. They are ATEX certified for use in explosive or dangerous environments and have been specifically designed to address the difficult pumping challenges found in the oil and gas, process, and marine industries. 616/241-1611; www.blackmer.com.