One of the most significant additions to the product menus at retail fueling sites in the past 15 years has been Diesel Exhaust Fluid (DEF), the use of which became mandated when the U.S. Environmental Protection Agency was looking for new and better ways to reduce the amount of sulfur-heavy emissions from diesel-powered trucks and automobiles and their harmful effects. In the latest edition of The Fueling Station Podcast, Ed Kammerer and Jonathan Stong of OPW Retail Fueling — the "Pod-troleum Guys" — welcome Dan Boyle, OPW-RF Product Manager - Underground, for a discussion on DEF's use and its challenging handling characteristics, which make selecting and deploying DEF-compatible dispensing equipment paramount in helping to ensure a safe, reliable, cost-effective and efficient DEF program.