Semler Industries has been providing high-quality equipment for the Chemical and Refined Fuels industry for over 50 years.  We are proud to offer our extensive application and industry knowledge and experience through our new line of Diesel Exhaust Fluid (or DEF) products.  In addition to supporting our carefully-selected equipment partners, Semler has always been known for manufacturing reliable, long-lasting industrial equipment; that tradition continues with the introduction of our DEF-Distributor.

Have more questions?  Visit our DEF Frequently Asked Questions page.