Description The OPW 21GU-050G DEF Nozzle Blue, is Compatible or For Use With Mis-Filling Prevention Device (MFPD Sold Separately) Key Features Miss-filling prevention device eliminates the risk of accidental DEF/AdBlue filling or environmental contamination Spout with magnetic interface prevents mis-filling mishaps Durable streamlined nozzle design for easy, comfortable nozzle handling and makes it easy to differentiate DEF/AdBlue products Outfitted in that familiar, and unmistakable "DEF/AdBlue Blue" with slogan badge for instant identification