Overview Reviews Product Description Diesel Exhaust Fluid (DEF) is a solution of urea and de-ionized water that is sprayed into the exhaust systems of diesel powered vehicles.It is also known as AdBlue and is standardized as ISO 22241.The fluid reacts to break down nitric oxide and nitrogen dioxide pollutants.The DEF dispensing hose has a tube made from a special peroxide cured EPDM rubber that minimizes contamination of the fluid. Greenline Industrial Hose Catalog Product Videos Custom Field Product Reviews Write a Review Write a Review × Greenline 3/4" DEF Dispensing Hose G822DEF-075 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *