Marine and rail applications now require Tier 4 engine standards which means DEF is required.  Also, fuels can easily be contaminated by dirty or humid environments.  Any interruption of engine use means lost time.  Let Semler Industries show you why we’re one of the leading manufacturers of equipment for fuel polishing, fuel transfer, diesel exhaust fluid dosing and other equipment to keep your ship or locomotive operational. Check out our unique solutions and call or email us for more information.